| 1641 Depositions | Trinity College Dublin, Manuscripts and Archives Department | https://1641.tcd.ie/ | |
| 1798 Rebellion | Kilmainham Gaol Museum | | |
| 1803 Rebellion | Kilmainham Gaol Museum | | |
| A Catalogue of the manuscripts of Nuala Ní Dhomhnaill | University of Galway Archives | https://archivesearch.lib... | |
| A.A. Watt Papers | Public Record Office of Northern Ireland | | |
| Abbey Theatre Papers | National Library of Ireland | | |
| Abbeyleix Poor Law Union | Laois Local Studies | | |
| Abercorn Papers | Public Record Office of Northern Ireland | | |
| Abington Papers | National Library of Ireland | | |
| Academic Staff Association University College Dublin Records | UCD Archives | | |
| Acc 5148 | National Library of Ireland | | |
| Account of Catholic Orphanages | National Library of Ireland | | |
| Achill Island Improvement Fund | Dublin City Library and Archive | | |
| Achill Island Mission: Irish Society | National Library of Ireland | | |
| Achill Mission Estate | Representative Church Body Library | | |
| Ada Lewis Winter Distress Fund | Dublin City Library and Archive | | |
| Adair of Loughanmore Papers | Public Record Office of Northern Ireland | | |
| Adelaide Hospital Archive | Adelaide Hospital | https://manuscripts.catal... | |
| Adlecron family | National Library of Ireland | | |
| Adoption Society (Ireland) Papers | National Library of Ireland | | |
| Aggie Hanley Collection | University of Galway Archives | | |
| Aghalee Rural District Council Records | Public Record Office of Northern Ireland | | |
| Agnes O'Farrelly Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Airfield Archive | OPW-Maynooth University Archive and Research Centre (OMARC) | | |
| Albert Agricultural College Papers | UCD Archives | | |
| Album of picture postcards of actors | Irish Theatre Archive | | |
| Aldworth photograph album | Cork City and County Archives | | |
| Alexander Frazer notes and drawings | RCSI Heritage Collections | | |
| Alexander Hamilton Papers | Armagh Robinson Library | | |
| Alexander Papers | Public Record Office of Northern Ireland | | |
| Algoe Family and Estate | National Library of Ireland | | |
| Alice Stopford Green Papers | National Library of Ireland | | |
| Alnwick Papers | Public Record Office of Northern Ireland | | |
| Amanda McKittrick Ros Papers | Belfast Central Library | | |
| Amy Mander Papers | National Library of Ireland | | |
| An Bord Altranais (NMBI) | UCD Archives | https://www.ucd.ie/archiv... | |
| An Túr Gloine Archive | National Gallery of Ireland Library | | |
| Anderson Papers | Public Record Office of Northern Ireland | | |
| Andrew Higgins, 1881-1889 | Kerry Diocesan Archives (RC) | | |
| Andrews Papers | Public Record Office of Northern Ireland | | |
| Anglesey Papers | Public Record Office of Northern Ireland | | |
| Anglo-Irish War and Treaty | Kilmainham Gaol Museum | | |
| Anne Elizabeth Maguire | Representative Church Body Library | | |
| Anne James Photographic Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Anne Yeats Collection | National Gallery of Ireland Library | https://sourcenationalgal... | |
| Annesley Papers | Public Record Office of Northern Ireland | | |
| Annie King Papers | Fermanagh County Museum, Enniskillen Castle | | |
| Annie O'Donnell Letters | UCD Special Collections | https://www.ucd.ie/specia... | |
| Anthony Barry Photographic Collection | Cork City and County Archives | https://publications.cork... | http://catalogue.corkarch... |
| Antrim Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Antrim Borough Council | Ballymena Central Library | | |
| Antrim County Council Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Antrim Rural District Council Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Antrim Town Commissioners Records | Public Record Office of Northern Ireland | | |
| Application and Report Book (Outdoor Relief) | Offaly Archives | | |
| Archbishop Michael Kieran Archive | Armagh Diocesan Archive (RC) | | |
| Archdale Papers | Public Record Office of Northern Ireland | | |
| Archdiocese of Armagh (Church of Ireland) Records | Public Record Office of Northern Ireland | | |
| Archive of Irish Theatre Company | Irish Theatre Archive | | |
| Archivium Generale | Irish Dominican Congregation Archives | | |
| Ard-Fheiseanna Connradh na Gaedilge | University of Galway Archives | | |
| Ardain magazine | Irish Theatre Archive | | |
| Ardee Local Authority Records | Louth County Archives | | |
| Ardee Poor Law Union | Louth County Archives | | |
| Ardfert and Aghadoe Clergy Widows' Fund Society | Representative Church Body Library | | |
| Armagh Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Armagh County Council Records | Cultural Heritage Services Library, Armagh
Public Record Office of Northern Ireland | | |
| Armagh Rural District Council Records | Public Record Office of Northern Ireland | | |
| Armagh Urban District Council Records | Cultural Heritage Services Library, Armagh
Public Record Office of Northern Ireland | | |
| Armstrong Papers | Public Record Office of Northern Ireland | | |
| Arnold Family | Trinity College Dublin, Manuscripts and Archives Department | | |
| Arnold March Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Arnold-Forster | Trinity College Dublin, Manuscripts and Archives Department | | |
| Arran Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Art Collection | Tower Museum, Derry-Londonderry | | |
| Art Department | Ulster Museum, Belfast | | |
| Arthur Wilson Stelfox Papers | Ulster University Archive & Special Collections, Coleraine Campus | https://www.rascal.ac.uk/... | |
| Artists on Education | Trinity College Dublin, Manuscripts and Archives Department | | |
| Artists' Association of Ireland | National Irish Visual Arts Library (NIVAL) | | |
| Arts Advisory Committee | Waterford City Archives | | |
| Ashbourne Papers | Public Record Office of Northern Ireland | | |
| Ashe Papers | National Library of Ireland | | |
| Ashleigh House School Papers | Public Record Office of Northern Ireland | | |
| Assistant Under Secretary's Office | Public Record Office of Northern Ireland | | |
| Assize Indictments for Armagh | Armagh Robinson Library | | |
| Association for the Relief of Distressed Protestants | Representative Church Body Library | | |
| Association of Secondary Teachers, Ireland | Irish Labour History Museum | | |
| Athlone Local Authority Records | Westmeath County Archives Department | | |
| Athlone Poor Law Union | Westmeath County Archives Department | | |
| Athlone Rural District Council | Roscommon Local Studies and Archives
Westmeath County Archives Department | | |
| Athy Poor Law Union | Kildare Local Studies, Genealogy and Archives Department | | |
| Atkinson Papers | Public Record Office of Northern Ireland | | |
| Attic Press/Róisín Conroy Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Augustus John Foster Papers | Public Record Office of Northern Ireland | | |
| Austin Stack Papers | National Library of Ireland | | |
| Autograph Book of John Lennon/Maggie B. Corcoran | Offaly Archives | https://www.offalyarchive... | |
| Autograph Letters | Royal Irish Academy | | |
| Autographs | Irish Theatre Archive | | |
| Bailie Papers | Public Record Office of Northern Ireland | | |
| Baird Papers | Public Record Office of Northern Ireland | | |
| Baker Papers | National Library of Ireland | | |
| Ballina Poor Law Union | National Library of Ireland | | |
| Ballina Urban District Council | Mayo Local History Department | | |
| Ballinamore Rural District Council | Leitrim Local Studies Department | | |
| Ballinasloe District Lunatic Asylum | St Brigid's Hospital, Ballinasloe | | |
| Ballinasloe Poor Law Union | Galway County Council Archives | | |
| Ballinasloe Urban District Council & Town Commissioners | Galway County Council Archives | | |
| Ballinrobe Poor Law Union | Mayo Local History Department
National Library of Ireland | | |
| Ballinrobe Rural District Council | Mayo Local History Department | | |
| Ballitore Papers | National Library of Ireland | | |
| Ballybay Papers | National Library of Ireland | | |
| Ballycastle Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Ballycastle Rural District Council Records | Public Record Office of Northern Ireland | | |
| Ballyclare Urban District Council Records | Public Record Office of Northern Ireland | | |
| Ballyglunin Papers | National Archives of Ireland
University of Galway Archives | | |
| Ballymahon Poor Law Union | Longford Archives and Local Studies | | |
| Ballymahon Rural District Council | Longford Archives and Local Studies | | |
| Ballymena Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Ballymena Borough Council | Ballymena Central Library | | |
| Ballymena Rural District Council Records | Public Record Office of Northern Ireland | | |
| Ballymena Urban District Council and Borough Council Records | Public Record Office of Northern Ireland | | |
| Ballymoney Board of Guardian Records | Ballymena Central Library
Ballymoney Library | | |
| Ballymoney Board of Guardians | Public Record Office of Northern Ireland | | |
| Ballymoney Borough Council Records | Ballymena Central Library | | |
| Ballymoney District Council Records | Ballymena Central Library | | |
| Ballymoney Rural District Council Records | Public Record Office of Northern Ireland | | |
| Ballymore Rural District Council | Westmeath County Archives Department | | |
| Ballyshannon Medical Relief Registers | Donegal County Archives | | |
| Ballyshannon Poor Law Union | Donegal County Archives | | |
| Ballyshannon Rural District Council Records | Donegal County Archives | | |
| Balrothery Poor Law Union and Rural District Council | Fingal County Archive
National Archives of Ireland | | |
| Balrothery Rural District Records | Fingal County Archive | | |
| Baltinglass Rural District Council | Wicklow Library and Archives | | |
| Balymoney Urban District Council Records | Public Record Office of Northern Ireland | | |
| Banbridge Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Banbridge Masonic Lodge Papers | Public Record Office of Northern Ireland | | |
| Banbridge number 2 Rural District Council Records | Public Record Office of Northern Ireland | | |
| Banbridge Rural District Council Records | Public Record Office of Northern Ireland | | |
| Banbridge Urban District Council Records | Cultural Heritage Services Library, Armagh
Public Record Office of Northern Ireland | | |
| Bangor Borough Council Records | Public Record Office of Northern Ireland | | |
| Bangor Borough/ North Down Borough Council Records | North Down Museum | | |
| Bankruptcy Records | Public Record Office of Northern Ireland | | |
| Banks Gift | National Library of Ireland | | |
| Bantry Estate Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | https://libguides.ucc.ie/... |
| Barnacle Papers | University of Galway Archives | | |
| Barr Family Papers | Public Record Office of Northern Ireland | | |
| Barrett Estate | Sligo Archives Service | | |
| Barry Desmond Collection | UCD Archives | | |
| Bartholomew Crotty Papers | Cloyne Diocesan Archive (RC) | | |
| Barton Papers | National Archives of Ireland
National Library of Ireland | | |
| Bateman Papers | National Archives of Ireland | | |
| Bawnboy Union, Material relating to the Board of Guardians | University of Galway Archives | | |
| BBC Northern Ireland Radio Archives | Ulster Folk and Transport Museum | | |
| BBC Rewind | British Broadcasting Corporation, Northern Ireland (BBC NI) | https://bbcrewind.co.uk/ | |
| BBC Scripts | Belfast Central Library | | |
| Beamish and Crawford Collection | Cork City and County Archives | | |
| Beatrice Esther ('Bea') Orpen | National Gallery of Ireland Library | https://sourcenationalgal... | |
| Beaufort Papers | National Library of Ireland
Trinity College Dublin, Manuscripts and Archives Department | | |
| Beck Papers | Public Record Office of Northern Ireland | | |
| Bedford Row Maternity Hospital | Limerick Archives | | |
| Beleek Rural District Council Records | Donegal County Archives
Public Record Office of Northern Ireland | | |
| Belfast Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Belfast Chamber of Commerce Papers | Public Record Office of Northern Ireland | | |
| Belfast Charitable Society Papers | Public Record Office of Northern Ireland | | |
| Belfast Corporation Records | Public Record Office of Northern Ireland | | |
| Belfast County Borough Council Records | Public Record Office of Northern Ireland | | |
| Belfast Operative Bakers Friendly and Allied Trades Society | UCD Archives | | |
| Belfast Teachers' Association Papers | Public Record Office of Northern Ireland | | |
| Belfast Telegraph Archive | Public Record Office of Northern Ireland | | |
| Belgian Refugees Committee | UCD Archives | https://www.ucd.ie/archiv... | |
| Bellew Papers | National Library of Ireland | | |
| Bellews of Barmeath | National Archives of Ireland | | |
| Belmore Papers | Public Record Office of Northern Ireland | | |
| Belmullet Poor Law Union | National Library of Ireland | | |
| Belshaw Collection | Royal Irish Academy | | |
| Beresford Papers | Public Record Office of Northern Ireland | | |
| Bernard O'Rourke Papers | UCD Archives | | |
| Berwick Papers | Public Record Office of Northern Ireland | | |
| Bessborough Papers | National Library of Ireland | | |
| Betham Collection | Royal Irish Academy | | |
| Betham's Abstracts | National Archives of Ireland | | |
| Bethany Home | Representative Church Body Library | | |
| Bishop Anthony Dopping Papers | Armagh Robinson Library | | |
| Bishop Charles Sugrue, 1797-1825 | Kerry Diocesan Archives (RC) | | |
| Bishop Collins | Cloyne Diocesan Archive (RC) | | |
| Bishop Copinger | Cloyne Diocesan Archive (RC) | | |
| Bishop Cornelius Denvir Papers | Down and Connor Diocesan Archive (RC) | | |
| Bishop Cornelius Egan, 1825 - 1856 | Kerry Diocesan Archives (RC) | | |
| Bishop David Moriarty, 1856-1877 | Kerry Diocesan Archives (RC) | | |
| Bishop David Walsh Papers | Cloyne Diocesan Archive (RC) | | |
| Bishop Denis Moynihan, 1953 - 1969 | Kerry Diocesan Archives (RC) | | |
| Bishop Diarmuid O'Suilleabhain, 1985-1994 | Kerry Diocesan Archives (RC) | | |
| Bishop Eamonn Casey, 1969-1976 | Kerry Diocesan Archives (RC) | | |
| Bishop Foy's School Waterford | Representative Church Body Library | | |
| Bishop Kevin McNamara, 1976-1984 | Kerry Diocesan Archives (RC) | | |
| Bishop M. Collins | Cloyne Diocesan Archive (RC) | | |
| Bishop Timothy Murphy Papers | Cloyne Diocesan Archive (RC) | | |
| Bishop W. Coppinger | Cloyne Diocesan Archive (RC) | | |
| Bishop W. Keane Papers | Cloyne Diocesan Archive (RC) | | |
| Black Papers | Public Record Office of Northern Ireland | | |
| Blackrock | Dún Laoghaire-Rathdown County Council | https://www.dlrcoco.ie/si... | |
| Blackwood Papers | Public Record Office of Northern Ireland | | |
| Blair Papers | Public Record Office of Northern Ireland | | |
| Blake Forester Collection | University of Galway Archives | | |
| Blake of Ballyglunin Collection (Additional) | University of Galway Archives | | |
| Blake of Ballyglunin Park Papers | National Library of Ireland | https://archivesearch.lib... | |
| Blake Papers | National Library of Ireland | | |
| Board Minutes of the National Gallery of Ireland | National Gallery of Ireland Library | https://sourcenationalgal... | |
| Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Bodyke Eviction Papers | University of Galway Archives | | |
| Bolton Library Archive | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | |
| Bolton Manuscripts | National Library of Ireland | | |
| Book 9 | Loreto Archives | | |
| Book of Poetry | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Book of transference certificates, Presbyterian Church, Birr | Offaly Archives | | |
| Borrisokane Local Authority Records | Tipperary Studies | | |
| Borrisokane Poor Law Union | Tipperary Studies | | |
| Borrisokane Rural District Council | Tipperary Studies | | |
| Bourke Papers | National Library of Ireland | | |
| Box File/Barton | Wicklow Library and Archives | | |
| Boyle Local Authority Records | Roscommon Local Studies and Archives | | |
| Boyle Papers | Public Record Office of Northern Ireland | | |
| Boyle Rural District Council | Roscommon Local Studies and Archives
Sligo Archives Service | | |
| Brendan Smith Theatre Academy | Irish Theatre Archive | | |
| Brereton Estate | Sligo Archives Service | | |
| Brett Collection | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Brett Papers | Public Record Office of Northern Ireland | | |
| Bridget Stafford | UCD Archives | https://www.ucd.ie/archiv... | |
| Bridgit Bond Papers | Tower Museum, Derry-Londonderry | | |
| Brigidine Sisters, Irish-United Kingdom Province | Delany Archive | https://www.delanyarchive... | |
| Brinkley Estate | Sligo Archives Service | | |
| Briscoe Papers | National Library of Ireland | | |
| Briscoe Theatre Programmes | University of Galway Archives | | |
| British Medical Association | Irish Medical Organisation | | |
| Brodrick Papers | National Library of Ireland | | |
| Brooke of Killeagh Papers | Public Record Office of Northern Ireland | | |
| Brookeborough Papers | Public Record Office of Northern Ireland | | |
| Brother Allen Archival Collection | Brother Allen Archive | | |
| Brown of Clonboy Papers | National Library of Ireland | | |
| Browne Papers | National Library of Ireland | | |
| Browne-Lecky Papers | Public Record Office of Northern Ireland | | |
| Brownlow Papers | Public Record Office of Northern Ireland | | |
| Bruce Papers | National Library of Ireland
Public Record Office of Northern Ireland | | |
| Bruen of Oakpark (County Carlow) Papers | National Library of Ireland | | |
| Bryan Family Papers | UCD Archives | | |
| Bryson House Records | Public Record Office of Northern Ireland | | |
| Buckingham Free School | Cork City and County Archives | | |
| Buckley Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Bulfin Papers | National Library of Ireland | | |
| Bulmer Hobson Papers | National Library of Ireland | | |
| Bunbury Papers | Public Record Office of Northern Ireland | | |
| Buncrana Urban District Council | Donegal County Archives | https://www.donegalcoco.i... | |
| Bundoran Urban District Council Records | Donegal County Archives | https://www.donegalcoco.i... | |
| Bureau of Military History | Military Archives | | |
| Burges Papers | Public Record Office of Northern Ireland | | |
| Burke Family Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Burton Papers | Carlow County Archive
National Library of Ireland | | |
| Bushe Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Business Records of John Dowden and Company, Cork | Cork City and County Archives | | |
| Butler Archbishops of Cashel and Emly, 1712-1791 | Cashel and Emly Diocesan Archives (RC) | | |
| Butler Collection | Trinity College Dublin, Manuscripts and Archives Department | | |
| Byrne Papers | Dublin Diocesan Archives (RC)
National Archives of Ireland | | |
| Caherciveen Poor Law Union | Kerry Local Studies and Archives Department | | |
| Caherciveen Rural District Council | Kerry Local Studies and Archives Department | | |
| Cahir Healy Papers | Public Record Office of Northern Ireland | | |
| Cairnes Papers | National Library of Ireland | | |
| Caledon Papers | Public Record Office of Northern Ireland | | |
| Callan Poor Law Union | Kilkenny Local Studies Department | | |
| Callan Rural District Council | Kilkenny Local Studies Department | | |
| Camden Papers | Public Record Office of Northern Ireland | | |
| Caminondo Letters | University of Galway Archives | | |
| Campbell Allen Papers | Public Record Office of Northern Ireland | | |
| Cannock Papers | Limerick Archives | | |
| Canon Leslie Papers | Public Record Office of Northern Ireland | | |
| Canon Leslie Collection | National Library of Ireland | | |
| Canon Power Papers | Cork City and County Archives
Waterford City Archives | | |
| Caoineadh Máire Ní hÁrdigain | University of Galway Archives | | |
| Captured Documents | Military Archives | | |
| Cardinal John D'Alton Archive | Armagh Diocesan Archive (RC) | | |
| Cardinal Logue Archive | Armagh Diocesan Archive (RC) | | |
| Cardinal MacRory Archive | Armagh Diocesan Archive (RC) | | |
| Cardinal O'Donnell Archive | Armagh Diocesan Archive (RC) | | |
| Carleton, Atkinson and Sloan Solicitors Papers | Public Record Office of Northern Ireland | | |
| Carlow Local Authority Records | Carlow County Archive | | |
| Carlow Monthly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| Carlow Poor Law Union | Carlow County Archive | | |
| Carlow Protestant Orphan Society | Representative Church Body Library | | |
| Carlow Urban District Council | Carlow County Archive | | |
| Caroline Walsh Papers | UCD Special Collections | https://www.ucd.ie/specia... | |
| Carrick-on-Shannon Local Authority Records | Roscommon Local Studies and Archives | | |
| Carrick-on-Shannon Poor Law Union | Leitrim Local Studies Department | | |
| Carrick-on-Shannon Rural District Council | Leitrim Local Studies Department | | |
| Carrick-on-Suir Rural District Council | Kilkenny Local Studies Department
Waterford County Archives | | |
| Carrickfergus Borough Council Records | Ballymena Central Library | | |
| Carrickfergus District Council | Ballymena Central Library | | |
| Carrickmacross Poor Law Union | Monaghan County Library Genealogy and Local History Department | | |
| Carrickmacross Rural District Council | Monaghan County Library Genealogy and Local History Department
Public Record Office of Northern Ireland | | |
| Carson Papers | Public Record Office of Northern Ireland | | |
| Casement Papers | National Library of Ireland | | |
| Cashel Poor Law Union | Tipperary Studies | | |
| Cashel Rural District Council | Tipperary Studies | | |
| Cassettes and Slides | Loreto Archives | | |
| Castle Oliver Papers | National Library of Ireland | | |
| Castle Taylor Papers | University of Galway Archives | | |
| Castle Ward papers | National Library of Ireland | | |
| Castlebar Poor Law Union | Mayo Local History Department
National Library of Ireland | | |
| Castlebar Rural District Council | Mayo Local History Department | | |
| Castlebar Urban District Council | Mayo Local History Department | | |
| Castleblaney Urban District Council | Monaghan County Library Genealogy and Local History Department | | |
| Castleblayney Local Authority Records | Monaghan County Library Genealogy and Local History Department | | |
| Castleblayney Poor Law Union | Monaghan County Museum | | |
| Castlecomer Poor Law Union | Kilkenny Local Studies Department | | |
| Castlecomer Rural District Council | Kilkenny Local Studies Department | | |
| Castlederg Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Castlederg Rural District Council Records | Public Record Office of Northern Ireland | | |
| Castlehackett Papers | University of Galway Archives | | |
| Castlerea Local Authority Records | Roscommon Local Studies and Archives | | |
| Castlerea Poor Law Union | Roscommon Local Studies and Archives | | |
| Castlerea Rural District Council Records | Public Record Office of Northern Ireland | | |
| Castlereagh Papers | Public Record Office of Northern Ireland | | |
| Castletown Papers | Irish Architectural Archive
National Library of Ireland
Public Record Office of Northern Ireland | | |
| Castleward Papers | Public Record Office of Northern Ireland | | |
| Catholic Emancipation | Kilmainham Gaol Museum | | |
| Catholic University of Ireland Papers | UCD Archives | | |
| Caulfield Family Papers | UCD Archives | | |
| Causalties 1916 | Military Archives | | |
| Cavan Agricultural Committee | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan Board of Health and Public Assistance | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan County Archives Private Collections | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan County Council Minutes | Cavan County Archives | https://www.cavanlibrary.... | https://www.cavanlibrary.... |
| Cavan County Rate Books | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan Drama Festival | Cavan County Archives | | |
| Cavan Grand Jury Records | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan National School Records | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan Rural District Councils | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan Rural District Register of Cowkeepers, etc. | Cavan County Archives | https://www.cavanlibrary.... | |
| Cavan Town Commissioners | Cavan County Archives | https://www.cavanlibrary.... | |
| Cearbhall Ó Dálaigh | | |
| Celbridge No. 2 Rural District Council | Fingal County Archive | | |
| Celbridge Poor Law Union | Kildare Local Studies, Genealogy and Archives Department | | |
| Celbridge Rural District Council | Fingal County Archive | | |
| Census | National Archives of Ireland | | |
| Central Criminal Court | National Archives of Ireland | | |
| Central Registry Files | Military Archives | | |
| Chancery Bills (A-Z, AA-BB) | National Archives of Ireland | | |
| Charitable Donations and Bequests | National Archives of Ireland | | |
| Charlemont Papers | Public Record Office of Northern Ireland | | |
| Charles Stewart Parnell Hamilton, MD | RCSI Heritage Collections | | |
| Charleville Forest Papers | Offaly Archives | | |
| Charlotte Brooke Reliques of Irish Poetry | Cavan County Archives | https://www.cavanlibrary.... | |
| Cheevers Family of Killyan, Co. Galway | University of Galway Archives | | |
| Chetwood Papers | National Library of Ireland | | |
| Chief Crown Solicitor | National Archives of Ireland | | |
| Chief Crown Solicitor's Office | National Archives of Ireland | | |
| Chief Secretary's correspondence | National Archives of Ireland | | |
| Chief Secretary's Office Registered Papers | National Archives of Ireland | | |
| Childers Papers | National Library of Ireland | | |
| Children's and Female Voice Repertoire | Contemporary Music Centre | https://www.cmc.ie/catalo... | |
| Children's Home for Girls, Sunnyside, Kilternan, County Dublin | National Archives of Ireland | | |
| Christina Doyle, letters and papers re prison conditions for Irish internee | National Library of Ireland | | |
| Christopher Robson Photographic Collection | National Photographic Archive | https://www.nli.ie/en/udl... | |
| Church Education Society for Ireland | Representative Church Body Library | | |
| Church Missionary Society Ireland | Representative Church Body Library | | |
| Church of England Zenana Missionary Society, Hibernian Auxiliary | Representative Church Body Library | | |
| Church of Ireland Clergy Widows and Orphans Society | Representative Church Body Library | | |
| Church of Ireland Records | Public Record Office of Northern Ireland | | |
| Church of Ireland Women's Ministry Group | Representative Church Body Library | | |
| Church Records | Public Record Office of Northern Ireland | | |
| Chute Papers | Kerry Local Studies and Archives Department | | |
| Circuit Court | National Archives of Ireland | | |
| Circuit Court Records | National Archives of Ireland | | |
| City Arts Centre | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| City Law Advisor relating to Housing of the Working Classes | Waterford City Archives | | |
| City Law Advisor relating to Small Dwelling Acquisitions | Waterford City Archives | | |
| City of Cork Vocational Education Committee Records | Cork City and County Archives | | |
| Civil War | Kilmainham Gaol Museum | | |
| Clancarty Papers | University of Galway Archives | | |
| Clanmorris Estate Papers | Public Record Office of Northern Ireland | | |
| Clanwilliam/Meade Papers | Public Record Office of Northern Ireland | | |
| Clare County Council | Clare County Archives | | |
| Clare County Library Photographic Archive | Clare County Archives | https://www.clarelibrary.... | |
| Clare Local Authority Records | Clare County Archives | | |
| Claremont Institution | National Archives of Ireland | | |
| Claremorris Congested Districts Board | University of Galway Archives | | |
| Claremorris Poor Law Union | National Library of Ireland | | |
| Clarke Papers | National Library of Ireland | | |
| Cleaver Estates in Co. Roscommon | University of Galway Archives | https://archivesearch.lib... | https://landedestates.ie/... |
| Clementine Churchill | UCD Archives | | |
| Clements family | Trinity College Dublin, Manuscripts and Archives Department | | |
| Clements Papers | National Library of Ireland
Trinity College Dublin, Manuscripts and Archives Department | | |
| Cleo Collection | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Clifden Papers | National Archives of Ireland | | |
| Clifden Poor Law Union | Galway County Council Archives | | |
| Clogheen Poor Law Union | Tipperary Studies | | |
| Clogheen Rural District Council | Tipperary Studies | | |
| Clogher Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Clogher Diocesan Records (RC) | Clogher Diocesan Archives (RC) | | |
| Clogher Rural District Council Records | Public Record Office of Northern Ireland | | |
| Clonbrock Papers | National Library of Ireland | | |
| Clonbrock Photographic Collection | National Photographic Archive | https://catalogue.nli.ie/... | |
| Cloncurry Papers | National Library of Ireland | | |
| Clones North Rural District Council Records | Monaghan County Library Genealogy and Local History Department
Public Record Office of Northern Ireland | | |
| Clonmel Corporation | Tipperary County Archives | | |
| Clonmel District Lunatic Asylum | Tipperary Studies | | |
| Clonmel Poor Law Union | Tipperary Studies | | |
| Clonmel Rural District Council | Tipperary Studies
Waterford County Archives | | |
| Clotworthy House Papers | Public Record Office of Northern Ireland | | |
| Clubs, Societies and Trade Unions | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cobh Urban District Council Records | Cork City and County Archives | | |
| Cogry Flax Spinning Company Papers | Public Record Office of Northern Ireland | | |
| Colclough Papers | National Library of Ireland | | |
| Coleraine Board of Guardian Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Coleraine Borough Council Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Coleraine Rural District Council Records | Public Record Office of Northern Ireland | | |
| Colleen Bawn | Waterford City Archives | | |
| College Records | University of Galway Archives | | |
| Collis & Ward solicitors | National Archives of Ireland | | |
| Colonel Maurice Moore Papers | National Library of Ireland | | |
| Colthurst Papers | Cork City and County Archives | | |
| Comhairle Céilí Newsletter, 1967-1969 | Tipperary Studies | | |
| Comhchaidreamh na Gaillimhe | University of Galway Archives | | |
| Commission of Vocational Organisation | National Library of Ireland | | |
| Communications Union of Ireland | Communications Workers Union | | |
| Communist Party of Ireland | Dublin City Library and Archive | | |
| Communist Party Papers | Public Record Office of Northern Ireland | | |
| Comptroller and Auditor General | National Archives of Ireland | | |
| Concerned Clergy Group | Representative Church Body Library | | |
| Connolly/Bunbury Letters | Irish Architectural Archive | | |
| Conolly Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Conradh na Gaelige Papers | National Library of Ireland | | |
| Conroy Papers | Ardagh and Clonmacnoise Diocesan Archives (RC) | | |
| Constitution Committee Records | National Archives of Ireland | | |
| Constitutions and Rule Books, Old and New | Loreto Archives | | |
| Convent of Divine Providence, Foxford | Religious Sisters of Charity Archives | | |
| Convict Reference Files, 1836-1922 | National Archives of Ireland | | |
| Conwell Letters | Maynooth University and St Patrick's College, Maynooth | | |
| Cooke of Borrisoleigh Collection | Tipperary Studies | https://www.tippstudiesdi... | |
| Cookstown Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Cookstown Urban District Council Records | Cultural Heritage Services Library, Armagh
Public Record Office of Northern Ireland | | |
| Coole Rural District Council | Westmeath County Archives Department | | |
| Cooper Estate | Sligo Archives Service | | |
| Cooper Papers | Public Record Office of Northern Ireland | | |
| Cooper Penrose Papers | Cork City and County Archives | | |
| Coopershill Papers | Public Record Office of Northern Ireland | | |
| Coote Papers | Limerick Archives | | |
| Corbishley Family of St. John’s Athenry | University of Galway Archives | | |
| Cork 2005 Project | Cork Folklore Project | https://corkfolklore.org/... | |
| Cork Boards of Public Assistance and Health | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cork City Council Early Committee Minute Books, 1867-1929 | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cork City Council Minutes | Cork City and County Archives | https://publications.cork... | |
| Cork City Council Records - Miscellaneous | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cork City Walls Property Survey | Cork City and County Archives | https://publications.cork... | |
| Cork County Council Minutes 1898-1966 | Cork City and County Archives | | |
| Cork County Council Records - Miscellaneous | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cork County Town Councils | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cork Deeds | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Cork Eye Ear and Throat Hospital | Cork City and County Archives | | |
| Cork Monthly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| Cork Operatives Bakers | UCD Archives | | |
| Cork Presbyterian Meeting House Records | Cork City and County Archives | | |
| Cork Protestant Orphan Society | Representative Church Body Library | | |
| Cork Rural District Councils | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cork Spinning and Weaving Company | Cork City and County Archives | https://corkarchives.ie/e... | |
| Cork Theatre Company | Irish Theatre Archive | | |
| Cormac Ó Cuilleanáin Papers | UCC Special Collections & Archives | | |
| Corofin Poor Law Union | Clare County Archives | | |
| Corofin Rural District Council | Clare County Archives | | |
| Corporation Estate Rentals | Waterford City Archives | | |
| Corr Collection | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Correspondence relating to Manchester and Leek | Loreto Archives | | |
| Correspondence relating to Navan | Loreto Archives | | |
| Correspondence with Bishops and Priests | Loreto Archives | | |
| Cosgrave Papers | National Archives of Ireland | | |
| Cotter family papers | National Library of Ireland | | |
| Council Books of the Corporation of Youghal | Cork City and County Archives | http://catalogue.corkarch... | |
| Count Plunkett Collection | National Library of Ireland | | |
| Countess Alice Murphy Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Countess Markievicz Letters | Sligo Archives Service | | |
| County Board of Health and Public Assistance | Wicklow Library and Archives | | |
| County Cavan Poor Law Union Records | Cavan County Archives | https://www.cavanlibrary.... | |
| County Clare Board of Health | Clare County Archives | | |
| County Cork Poor Law Records | Cork City and County Archives | | |
| County Down Photographic Collection | North Down Museum | | |
| County Kerry Local Authority Records | Kerry Local Studies and Archives Department | | |
| County Library Committee | Sligo Archives Service | | |
| County Monaghan Local Authority Records | Monaghan County Library Genealogy and Local History Department
Monaghan County Museum | | |
| County of Dublin Grand Jury | Fingal County Archive | | |
| County Roscommon Protestant Orphan Society | Representative Church Body Library | | |
| County Sligo Grand Jury | Sligo Archives Service | | |
| County Tipperary Monthly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| County Wexford Grand Jury Collection | Wexford County Archive | https://wexfordcountyarch... | |
| County Wexford Local Authority Records | Wexford County Archive | | |
| County Wexford Local Authority Records | Wexford County Archive | | |
| County Wexford Monthly Meetings | Religious Society of Friends in Ireland Historical Library | | |
| County Wexford Poor Law Commissioners | Wexford County Archive | | |
| Court of Criminal Appeal | National Archives of Ireland | | |
| Courtney Papers | Cork City and County Archives | | |
| Courtown Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Cowan Papers | UCD Archives | | |
| Craigavon Borough Council Records | Cultural Heritage Services Library, Armagh | | |
| Craigavon Bridge Collection | Tower Museum, Derry-Londonderry | | |
| Craigavon Papers | Public Record Office of Northern Ireland | | |
| Crampton Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Crawford Papers | Public Record Office of Northern Ireland | | |
| Creagh & Byrne (Matthew Byrne & Co.) Papers | Kerry Local Studies and Archives Department | | |
| Crime Branch Special Records | National Archives of Ireland | | |
| Criminal Index Files | National Archives of Ireland | | |
| Crofton Estate | Sligo Archives Service
University of Galway Archives | | |
| Crofton Papers | National Library of Ireland
Trinity College Dublin, Manuscripts and Archives Department | | |
| Croker Papers | Limerick Archives | | |
| Croom Board of Guardian Records | Limerick Archives | | |
| Croom Poor Law Union | Limerick Archives | | |
| Croskery Papers | Public Record Office of Northern Ireland | | |
| Crosse and Blackwell Papers | National Library of Ireland | | |
| Crossle Papers | | |
| Crossle/Smith volume xvii | National Archives of Ireland | | |
| Crossmaglen Rural District Council Records | Public Record Office of Northern Ireland | | |
| Crown and Peace Office County Kildare | National Archives of Ireland | | |
| Crown and Peace Office, County Mayo | National Archives of Ireland | | |
| Crown and Peace Records | Public Record Office of Northern Ireland | | |
| Crown Files at Assizes 1893-1894 | National Archives of Ireland | | |
| CSORP 1916 | National Archives of Ireland | | |
| Cuala Press Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Cuala Press correspondence with C. Harmsworth | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Cúirt Festival | University of Galway Archives | | |
| Cullen Papers | Dublin Diocesan Archives (RC) | | |
| Cumann Gaelach na hEaglaise | Representative Church Body Library | | |
| Cumann na nGaedheal and Fine Gael Parties | UCD Archives | | |
| Cumine Papers | Public Record Office of Northern Ireland | | |
| Cúnamh | Adoption Authority of Ireland | | |
| Cunningham (Belfast) Papers | Public Record Office of Northern Ireland | | |
| Cunningham Papers | Public Record Office of Northern Ireland | | |
| Curran Collection | UCD Special Collections | | |
| Custom House Papers | Limerick Archives | | |
| Customs and Excise | National Archives of Ireland | | |
| D'Alton Papers | National Library of Ireland | | |
| D'Alton, Richard, Family | Royal Irish Academy | | |
| D'Arcy Manuscripts | National Library of Ireland | | |
| D'Olier Papers | National Library of Ireland | | |
| D.C. Rushe Papers | Public Record Office of Northern Ireland | | |
| D.J. Neill Photographic Collection | North Down Museum | | |
| D.J. O'Donoghue Papers | UCD Archives | | |
| Dadwell Papers | Public Record Office of Northern Ireland | | |
| Dáil Éireann Cabinet Minutes and Files | National Archives of Ireland | | |
| Dáil Éireann Courts (Winding Up) Commission | National Archives of Ireland | | |
| Daily Report Book of No. 2 Clara National School | Offaly Archives | | |
| Dalkey | Dún Laoghaire-Rathdown County Council | https://www.dlrcoco.ie/si... | |
| Daly of Dunsandle Famiily | University of Galway Archives | | |
| Dangerous Lunatics Files, 1836-1922 | National Archives of Ireland | | |
| Daniel McCarthy, 1878-1881 | Kerry Diocesan Archives (RC) | | |
| Darkest Dublin Collection | Royal Society of Antiquaries of Ireland | | |
| Darnely Papers | Public Record Office of Northern Ireland | | |
| Darrynane and Other Poems | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Dartrey Papers | Public Record Office of Northern Ireland | | |
| David Comyn Papers | National Library of Ireland | | |
| De Ros Papers | Public Record Office of Northern Ireland | | |
| De Vere Papers | Limerick Archives
National Library of Ireland | | |
| Dean Rennison Papers | Armagh Robinson Library | | |
| Deane Lease | University of Galway Archives | | |
| Deed Boxes, Misc., NewShelf, Hand Lists of: | Religious Society of Friends in Ireland Historical Library | | |
| Deed Boxes, Miscellaneous, New Shelf Head Lists | Religious Society of Friends in Ireland Historical Library | | |
| Deeds | Religious Society of Friends in Ireland Historical Library | | |
| Deeny Papers | RCSI Heritage Collections | | |
| Delahoide Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Delvin Rural District Council | Westmeath County Archives Department | | |
| Denis Johnston | Trinity College Dublin, Manuscripts and Archives Department | | |
| Denis Johnston Papers | Trinity College Dublin, Manuscripts and Archives Department
Ulster University Archive & Special Collections, Coleraine Campus | | |
| Denis McCullough Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Department of Transport, Energy and Communications | National Archives of Ireland | | |
| Department of Agriculture | National Archives of Ireland | | |
| Department of An Taoiseach | National Archives of Ireland | | |
| Department of Economic Development Records | Public Record Office of Northern Ireland | | |
| Department of Education | National Archives of Ireland | | |
| Department of Education/Commissioners of National Education | National Archives of Ireland | | |
| Department of Environment | National Archives of Ireland | | |
| Department of Finance | National Archives of Ireland | | |
| Department of Foreign Affairs | National Archives of Ireland | | |
| Department of Gaeltacht | National Archives of Ireland | | |
| Department of Health | National Archives of Ireland | | |
| Department of Industry and Commerce | National Archives of Ireland | | |
| Department of Justice | National Archives of Ireland | | |
| Department of Labour and Labour Court | National Archives of Ireland | | |
| Department of Social Welfare | National Archives of Ireland | | |
| Department of the Marine | National Archives of Ireland | | |
| Department of the Prime Minister Records | Public Record Office of Northern Ireland | | |
| Department of Tourism, Transport and Communications | National Archives of Ireland | | |
| Department of Transport, Energy and Communications | National Archives of Ireland | | |
| DeRenzy Papers | Offaly Archives | | |
| Desmond and Mabel Fitzgerald Papers | UCD Archives | | |
| Desmond Ryan Papers | UCD Archives | | |
| DeVere Papers | National Library of Ireland | | |
| Devon Estate Rentals | Limerick Archives | | |
| Devoy Papers | National Library of Ireland | | |
| Dialect Survey of Ireland | University of Galway Archives | | |
| Diaries of Lily Stephens and her daughter Ann Porter, née Stephens | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Diarmuid Lynch Papers | National Library of Ireland | | |
| Diary of Mrs Henry King | National Library of Ireland | | |
| Digby Estate Valuation and Survey | Offaly Archives | | |
| Digby Irish Estates | Offaly Archives | | |
| Dillon Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Dimond Papers | National Library of Ireland | | |
| Dingle Poor Law Union | Kerry Local Studies and Archives Department | | |
| Dingle Rural District Council | Kerry Local Studies and Archives Department | | |
| Dinneen Papers | National Library of Ireland | | |
| Diocesan of Cloyne, 1634-1934 | Representative Church Body Library | | |
| Diocese of Clogher (Church of Ireland) Records | Public Record Office of Northern Ireland | | |
| Diocese of Clogher (Roman Catholic) Records | Public Record Office of Northern Ireland | | |
| Diocese of Clogher, 1690-1944 | Representative Church Body Library | | |
| Diocese of Derry and Raphoe (Church of Ireland) Records | Public Record Office of Northern Ireland | | |
| Diocese of Dromore (Roman Catholic) Records | Public Record Office of Northern Ireland | | |
| Diocese of Dublin | Representative Church Body Library | | |
| Diocese of Killaloe and Kilfenora | Representative Church Body Library | | |
| Diocese of Limerick, Ardfert and Aghadoe, 1693-1928 | Representative Church Body Library | | |
| Dispensary District Notices | Offaly Archives | | |
| Dissolved Companies Files | National Archives of Ireland | | |
| Doake Papers | Public Record Office of Northern Ireland | | |
| Dobbs Papers | Public Record Office of Northern Ireland | | |
| Dobbyn and McCoy, solicitors | National Library of Ireland | | |
| Documents and Letters | Loreto Archives | | |
| Domestic account books of Rosalie Morris O'Meara | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Dominican Archives, Cabra | Irish Dominican Congregation Archives | | |
| Dominican Convent, Cabra | National Library of Ireland | | |
| Domvile Papers | National Library of Ireland | | |
| Donaghadee Urban District Council Records | Public Record Office of Northern Ireland | | |
| Donaghmore Poor Law Union | Laois Local Studies | | |
| Donegal County Council | Donegal County Archives | | |
| Donegal Grand Jury Records | Donegal County Archives | https://www.donegalcoco.i... | https://www.donegalcoco.i... |
| Donegal Poor Law Union Records | Donegal County Archives | https://www.donegalcoco.i... | |
| Donegal Rural District Council Records | Donegal County Archives | https://www.donegalcoco.i... | |
| Donegall Papers | Public Record Office of Northern Ireland | | |
| Doneraile Papers | National Library of Ireland | | |
| Donnchadh Ó Briain Papers | UCD Archives | | |
| Dorman Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Dorothy Kay Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Dorothy Potter Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Dorothy Walker Archive | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Dowdell Estates | Sligo Archives Service | | |
| Dowden Papers | Cork City and County Archives | | |
| Dowman Deposit | Cork City and County Archives | | |
| Down County Council Records | Public Record Office of Northern Ireland | | |
| Downpatrick Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Downpatrick Rural District Council Records | Public Record Office of Northern Ireland | | |
| Downpatrick Urban District Council Records | Public Record Office of Northern Ireland | | |
| Downshire Papers | Public Record Office of Northern Ireland | | |
| Doyne Papers | National Library of Ireland | | |
| Dr Charles Curry Papers | National Library of Ireland | | |
| Dr Elinor Dorothy Price Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Dr Evelyn C. Tully Papers | University of Galway Archives | | |
| Dr John de Courcy-Ireland | UCD Archives | | |
| Dr Michael Quane Papers | National Library of Ireland | | |
| Dr Micheline Sheehy-Skeffington Papers | University of Galway Archives | | |
| Dr Patrick McCarten Papers | National Library of Ireland | | |
| Dr Ros Dixon Papers | University of Galway Archives | | |
| Dr Steevens Hospital Case Notes | RCSI Heritage Collections | | |
| Dr. Helena C. Concannon Collection | University of Galway Archives | | |
| Drapers' Company Records | Public Record Office of Northern Ireland | | |
| Drawing Room Circle Papers | Public Record Office of Northern Ireland | | |
| Drennan Papers | Public Record Office of Northern Ireland | | |
| Drennan-Duffin Papers | Public Record Office of Northern Ireland | | |
| Drogheda Papers | National Library of Ireland | | |
| Drogheda Poor Law Union | Louth County Archives | | |
| Dromore Urban District Council Records | Public Record Office of Northern Ireland | | |
| Dromore West Poor Law Union | Sligo Archives Service | | |
| Druid Theatre Company | University of Galway Archives | | |
| Dublin Board of Health | Fingal County Archive | | |
| Dublin City Ballet | Irish Theatre Archive | | |
| Dublin City Council | Dublin City Library and Archive | | |
| Dublin City Electoral Lists | Dublin City Library and Archive | | |
| Dublin Council of Trade Unions | Irish Labour History Museum
National Library of Ireland | | |
| Dublin County Council | Fingal County Archive | | |
| Dublin Electoral Lists Online, 1938-1964 | Dublin City Library and Archive | | |
| Dublin Grand Jury Records | UCD Archives | https://www.ucd.ie/archiv... | |
| Dublin Monthly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| Dublin Parish Records | Dublin City Library and Archive | https://databases.dublinc... | |
| Dublin Sanitary Association | Royal College of Physicians of Ireland | | |
| Dublin Theatre Festival | Irish Theatre Archive | | |
| Dublin University Mission to Chota Nagpur, India | Representative Church Body Library | | |
| Dublin University Players | Irish Theatre Archive | | |
| Dufferin and Ava Papers | Public Record Office of Northern Ireland | | |
| Duffin Papers | Public Record Office of Northern Ireland | | |
| Duke Estate | Sligo Archives Service | | |
| Dún Laoghaire Borough | Dún Laoghaire-Rathdown County Council | https://www.dlrcoco.ie/si... | |
| Dunalley Papers | National Library of Ireland | | |
| Dundalk Gas Company Minute Books | Louth County Archives | | |
| Dundalk Local Authority Records | Louth County Archives | | |
| Dundalk Poor Law Union | Louth County Archives | | |
| Dunfanaghy Poor Law Union | Donegal County Archives | | |
| Dunfanaghy Rural District Council Records | Donegal County Archives | | |
| Dungannon Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Dungannon Rural District Council Records | Public Record Office of Northern Ireland | | |
| Dungannon Urban District Council Records | Cultural Heritage Services Library, Armagh
Public Record Office of Northern Ireland | | |
| Dungarvan Poor Law Union | Waterford County Archives
Waterford County Museum | | |
| Dungarvan Rural District Council | Waterford County Archives | | |
| Dungarvan Urban District Council | Waterford County Archives | | |
| Dunleath Papers | Public Record Office of Northern Ireland | | |
| Dunraven Papers | Public Record Office of Northern Ireland
University of Limerick Special Collections and Archives | https://specialcollection... | |
| Dunshaughlin Poor Law Union | Meath Local Studies and Family History Department | | |
| Dunshaughlin Rural District Council | Meath Local Studies and Family History Department | | |
| E.D. Atkinson and Son Solicitors Papers | Public Record Office of Northern Ireland | | |
| Earbery Estate Maps Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Earl of Antrim Papers | Public Record Office of Northern Ireland | | |
| Earl of Bantry Papers | National Library of Ireland | | |
| Earl of Castle Stewart Papers | Public Record Office of Northern Ireland | | |
| Earl of Erne Estate Papers | Public Record Office of Northern Ireland | | |
| Earls of Antrim Papers | Public Record Office of Northern Ireland | | |
| Earnán de Blaghd Papers | National Library of Ireland | | |
| Easter Week | Kilmainham Gaol Museum | | |
| Edenderry Monthly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| Edgeworth Papers | National Library of Ireland | | |
| Edmund Downey Papers | National Library of Ireland | | |
| Edna O'Brien Papers | UCD Special Collections | https://www.ucd.ie/specia... | |
| Eithne Coyle O'Donnell | UCD Archives | https://www.ucd.ie/archiv... | |
| Eleanor Hassard Papers | Fermanagh County Museum, Enniskillen Castle | | |
| Eleanor Knott | Royal Irish Academy | | |
| Elizabeth Bloxham | UCD Archives | https://www.ucd.ie/archiv... | |
| Elizabeth Bowen Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Elizabeth Bowen Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Elizabeth Friedlander Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Elizabeth Lee | Irish Theatre Archive | | |
| Elphin and Ardagh Diocesan Papers, 1724-1975 | Representative Church Body Library | | |
| Emerson Tennent Papers | Public Record Office of Northern Ireland | | |
| Emigration Database | Mellon Centre for Migration Studies, Ulster American Folk Park | | |
| Emily Lawless Collection | Archbishop Marsh's Library | | |
| Emily Maria La Touche | Representative Church Body Library | | |
| Emly (Pery) Papers | Public Record Office of Northern Ireland | | |
| Endowed Schools | UCD Archives | | |
| Enery Estate Rental | Cavan County Archives | https://www.cavanlibrary.... | |
| English Schools | Erasmus Smith Schools Archives | | |
| Ennis Poor Law Union | Clare County Archives | | |
| Ennis Rural District Council | Clare County Archives | | |
| Ennis Urban District Council | Clare County Archives | | |
| Enniscorthy Poor Law Union Records | Wexford County Archive | | |
| Enniscorthy Rural District Council | Wexford County Archive | | |
| Enniskillen Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Enniskillen Borough Council Records | Public Record Office of Northern Ireland | | |
| Enniskillen Papers | Public Record Office of Northern Ireland | | |
| Enniskillen Rural District Council Records | Public Record Office of Northern Ireland | | |
| Ennistymon Poor Law Union | Clare County Archives | | |
| Ennistymon Rural District Council | Clare County Archives | | |
| Eoin Mac Neill Papers | National Library of Ireland | | |
| Eoin MacNeill Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Ephemera | Linen Hall Library
Ulster Museum, Belfast | | |
| Equal Opportunities Commission for Northern Ireland Records | Public Record Office of Northern Ireland | | |
| Erasmus Smith Archives | Erasmus Smith Schools Archives | | |
| Erinville Hospital Memorandum Book of Deaths | Cork City and County Archives | http://catalogue.corkarch... | |
| Ernest Blythe Papers | UCD Archives | | |
| Ernie O'Malley papers | UCD Archives | | |
| Erskine Childers Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Esmonde Papers | National Library of Ireland | | |
| Estoria Cinema, Galway | University of Galway Archives | | |
| Ethel Boole Voynich Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Ethna Byrne Costigan Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Eugene O'Curry Papers | UCD Archives | | |
| Eva Gore-Booth Papers | UCD Special Collections | https://www.ucd.ie/specia... | |
| Eva Whitla Papers | Public Record Office of Northern Ireland | | |
| Eve Watkins | Irish Theatre Archive | | |
| Evie Hone Collection | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Exham Flynn and Partners | Cork City and County Archives | | |
| Eyre Family Deeds | University of Galway Archives | | |
| Eyre Family of Eyreville | University of Galway Archives | | |
| F. and J. Clayton Company Records | Meath Local Studies and Family History Department | | |
| F.C.J. Swanton Papers | National Library of Ireland | | |
| F.J. Bigger Papers | National Library of Ireland | | |
| F.R. Higgins Papers | National Library of Ireland | | |
| F.S. Bourke Collection | National Library of Ireland | | |
| Falls and Hanna Papers | Public Record Office of Northern Ireland | | |
| Family and Estate Papers of Cliffe/Vigors | National Archives of Ireland | | |
| Family and estate records. 1611-1948 | National Archives of Ireland | | |
| Famine and Young Ireland | Kilmainham Gaol Museum | | |
| Fanad Health Club, District Nursing Association | Donegal County Archives | https://www.donegalcoco.i... | |
| Farnham Papers | National Library of Ireland
Public Record Office of Northern Ireland | | |
| Farnham Photograph Album | Cavan County Archives | https://www.cavanlibrary.... | |
| Father Hickey Papers | National Library of Ireland | | |
| Faulkner Papers | Public Record Office of Northern Ireland | | |
| Fay Papers | National Library of Ireland | | |
| Fayle Manuscripts | National Library of Ireland | | |
| Fearon Papers | Public Record Office of Northern Ireland | | |
| Fenian Papers | National Archives of Ireland | | |
| Fenians and Obstructionism | Kilmainham Gaol Museum | | |
| Ferguson Papers | Public Record Office of Northern Ireland | | |
| Fermanagh County Council Records | Public Record Office of Northern Ireland | | |
| Ferris Papers | Cork City and County Archives | | |
| Fever Hospital | Sligo Archives Service | | |
| Ffrench of Castleffrench Papers | National Library of Ireland | | |
| Fianna Fáil Party Collection | UCD Archives | https://www.ucd.ie/archiv... | |
| Fielden Manuscripts | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Financial Statement Book | Offaly Archives | | |
| Fingal Local Authority Records | Fingal County Archive | | |
| Fingall Papers | National Library of Ireland | | |
| Fionán MacColuim Papers | National Library of Ireland | | |
| FitzGerald Papers | Public Record Office of Northern Ireland | | |
| FitzMaurice Papers | National Library of Ireland | | |
| Fitzpatrick Papers | National Archives of Ireland
National Library of Ireland
UCD Archives | | |
| Fitzwilliam Family Papers | UCD Archives | | |
| Fitzwilliam Papers | National Library of Ireland
Public Record Office of Northern Ireland | | |
| Fleischmann Collection | UCC College Archives | | |
| Florence O'Donoghue Papers | National Library of Ireland | | |
| Flower Papers | National Library of Ireland | | |
| Fórsa (Civil and Public Service Union - CPSU) | Irish Labour History Museum | | |
| Fórsa (IMPACT) | Irish Labour History Museum | | |
| Fórsa (Public Service Executive Union - PSEU) | Irish Labour History Museum | | |
| Fortescue of Stephenstown Papers | National Library of Ireland | | |
| Foster of Gylde Papers | Public Record Office of Northern Ireland | | |
| Foster-Massereene Papers | Public Record Office of Northern Ireland | | |
| Fr Waldron Collection | University of Galway Archives | | |
| Frances-Mary Blake Collection | UCD Archives | https://www.ucd.ie/archiv... | https://www.ucd.ie/archiv... |
| Francis ('Frank') Edmund Stephens lantern slide collection | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Francis Joseph Bigger Archive | Belfast Central Library | https://www.rascal.ac.uk/... | |
| Francis S. Mahony Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Francis Stuart Papers | Ulster University Archive & Special Collections, Coleraine Campus | https://guides.library.ul... | |
| Francoise Henry Papers | Royal Irish Academy | | |
| Frank Bailey/Allen Family Archive | University of Galway Archives | | |
| Frank Gallagher Papers | National Library of Ireland | | |
| Frank Healy Papers | Cork City and County Archives | | |
| Frazer Manuscripts | National Archives of Ireland | | |
| Frederick J. Allan Papers | National Library of Ireland | | |
| Free Settlers Papers, 1828-1857 | National Archives of Ireland | | |
| Friends of the National Collections | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| G.H. Orpen Papers | National Library of Ireland | | |
| G.H. Kinahan | Royal Irish Academy | | |
| G.N. Plunkett Collection | National Library of Ireland | | |
| Gael Linn Collection | Irish Film Archive | | |
| Gaelic League | Kilmainham Gaol Museum | | |
| Galbraith Papers | Public Record Office of Northern Ireland | | |
| Galgorm Castle Papers | Public Record Office of Northern Ireland | | |
| Gallagher Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Galway Archaeological and Historical Society | University of Galway Archives | | |
| Galway Arts Festival | University of Galway Archives | | |
| Galway Corporation | University of Galway Archives | | |
| Galway County Board of Health and Public Assistance | Galway County Council Archives | | |
| Galway Dunsandle Estate | University of Galway Archives | | |
| Galway Hospital Records | Galway County Council Archives | | |
| Galway Infirmary | Galway County Council Archives | | |
| Galway MacIlwaine and Seeds Papers | Public Record Office of Northern Ireland | | |
| Galway Poor Law Union | Galway County Council Archives | | |
| Galway Rural District Council | Galway County Council Archives | | |
| Galway Urban Sanitary Authority | University of Galway Archives | | |
| Gardner Papers | Public Record Office of Northern Ireland | | |
| Garvagh Women's Institute Papers | Public Record Office of Northern Ireland | | |
| Gascoigne Papers | National Library of Ireland | | |
| Gate Theatre | Irish Theatre Archive | | |
| Gately Family Papers | Roscommon Local Studies and Archives | | |
| Gaussen Papers | Public Record Office of Northern Ireland | | |
| Gavan Duffy Papers | National Library of Ireland
Royal Irish Academy | | |
| Gehin Estate | Sligo Archives Service | | |
| Genealogy of Martin Ballinahinch Castle | University of Galway Archives | | |
| General Letters from M. Michael Corcoran 1914-1918 | Loreto Archives | | |
| General Prisons Board for Northern Ireland Records | Public Record Office of Northern Ireland | | |
| General Prisons Board Penal Files, 1883-1925 | National Archives of Ireland | | |
| George C. Mahon Papers | National Library of Ireland | | |
| George Coffey Papers | National Library of Ireland | | |
| George Furlong Papers | UCD Archives | | |
| George Shiels Collection | Ulster University Archive & Special Collections, Coleraine Campus | https://guides.library.ul... | |
| George Shiels Collection (Ballymoney) | Ballymoney Library | https://www.rascal.ac.uk/... | |
| Geraldine Cummins Papers | Cork City and County Archives | | |
| Geraldine Fitzgerald | Representative Church Body Library | | |
| Gerda Frömel Collection | National Gallery of Ireland Library | https://sourcenationalgal... | |
| Getty Papers | Public Record Office of Northern Ireland | | |
| Gideon Ouseley Papers | Public Record Office of Northern Ireland | | |
| Gilbert Collection, Charles O'Connor, letters and correspondence | Gilbert Library (Dublin City Library) | | |
| Gilbert Collection, Cork and Orrery, Earl of | Gilbert Library (Dublin City Library) | | |
| Gilbert Collection, Irish Saints | Gilbert Library (Dublin City Library) | | |
| Gilbert Collection, Law Cases, 1641- | Gilbert Library (Dublin City Library) | | |
| Gilbert Collection, Robinson Mss | Gilbert Library (Dublin City Library) | | |
| Gilbert Collection, Samuel Croker-King | Gilbert Library (Dublin City Library) | | |
| Gilbert Collection, St Ann's Guild | Gilbert Library (Dublin City Library) | | |
| Gilford Town Commissioners Records | Public Record Office of Northern Ireland | | |
| Girl Guides' Minute Books | Public Record Office of Northern Ireland | | |
| Girls' Friendly Society | Representative Church Body Library | | |
| Glen Ban School Collection | Laois Local Studies | https://laoislocalstudies... | |
| Glenamaddy Poor Law Union | Galway County Council Archives | | |
| Glenties Poor Law Union | Donegal County Archives | | |
| Glenties Rural District Council | Donegal County Archives | | |
| Glin Poor Law Union | Limerick Archives | | |
| Goff Papers | Public Record Office of Northern Ireland | | |
| Goldsmith Collection | Westmeath County Archives Department | | |
| Gorey Poor Law Union | Wexford County Archive | https://wexfordcountyarch... | |
| Gorey Rural District Council | Wexford County Archive | | |
| Gormanston Papers | National Library of Ireland | | |
| Gort Poor Law Union | Galway County Council Archives | | |
| Gortin Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Gortnahoe Rural District Council | Tipperary Studies | | |
| Gosford Papers | Public Record Office of Northern Ireland | | |
| Government Information Service | National Archives of Ireland | | |
| Governor General | National Archives of Ireland | | |
| GPB Suffragettes | National Archives of Ireland | | |
| Grace Plunkett Papers | National Library of Ireland | | |
| Graham Papers | Public Record Office of Northern Ireland | | |
| Granard Poor Law Union | Longford Archives and Local Studies | | |
| Grand Jury Presentments | | |
| Grand Jury Presentments Lent Assizes | Offaly Archives | | |
| Grand Jury Presentments Summer Assizes | Offaly Archives | | |
| Grand Jury Records | Wicklow Library and Archives | | |
| Grattan Papers | National Library of Ireland | | |
| Grattan Street Stories: Memory of Place | Cork Folklore Project | https://corkfolklore.org/... | |
| Graves Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Greene Family Collection | UCD Archives | | |
| Greer Papers | Public Record Office of Northern Ireland | | |
| Greer, Hamiliton, Gailey Solicitors Papers | Public Record Office of Northern Ireland | | |
| Grehan Estate Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | https://libguides.ucc.ie/... |
| Greville Estate Papers | National Archives of Ireland
UCC Special Collections & Archives | | |
| Greville-Nugent Papers | National Library of Ireland | | |
| Griffith's Valuation Field Book/Certified Field Books | Wicklow Library and Archives | | |
| Grogan Papers | National Library of Ireland | | |
| Groves Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Guy Stone Papers | Public Record Office of Northern Ireland | | |
| H. Montgomery Hyde Papers | Public Record Office of Northern Ireland | | |
| H.A. Boyd Papers | Ulster University Archive & Special Collections, Coleraine Campus | | |
| H.C. Weir Papers | Public Record Office of Northern Ireland | | |
| H.O. White | Trinity College Dublin, Manuscripts and Archives Department | | |
| Hall of Narrow Water Papers | Public Record Office of Northern Ireland | | |
| Hallahan 'Clonmult' Photographic Album (Digitised) | Cork City and County Archives | | |
| Halliday Collection | Royal Irish Academy | | |
| Hamilton of Brownhall Papers | Public Record Office of Northern Ireland | | |
| Hamilton Papers | Dublin Diocesan Archives (RC)
Public Record Office of Northern Ireland
Trinity College Dublin, Manuscripts and Archives Department | | |
| Hamilton, William Rowan | Royal Irish Academy | | |
| Hamilton-O'Regan Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Handlists/Portfolio | Religious Society of Friends in Ireland Historical Library | | |
| Handlists: Mss Boxes, Pamphlet Boxes, etc. | Religious Society of Friends in Ireland Historical Library | | |
| Handlists: Mss Boxes, Pamphlets Boxes, etc. | Religious Society of Friends in Ireland Historical Library | | |
| Hanlon Papers | Public Record Office of Northern Ireland | | |
| Harch Papers | National Library of Ireland | | |
| Harland and Wolfe Papers | Public Record Office of Northern Ireland | | |
| Harrington Papers | National Library of Ireland | | |
| Harry Kernoff Papers | National Library of Ireland | | |
| Hart Papers | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Hart-Synott Papers | UCD Archives | | |
| Harty Papers | Cork City and County Archives | | |
| Hastings and Sons Papers | Public Record Office of Northern Ireland | | |
| Hatch Papers | National Library of Ireland | | |
| Headford Papers | National Library of Ireland | | |
| Headfort Papers | National Library of Ireland | | |
| Headlam-Morley Papers | Ulster University Archive & Special Collections, Coleraine Campus | | |
| Hearne of Hearnesbrook Papers | University of Galway Archives | | |
| Heffernan Papers | National Library of Ireland | | |
| Helen Moloney Collection | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Helen Roe Collection | Laois Local Studies | https://laoislocalstudies... | |
| Helen Waddell Papers | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Helena Moloney Collection | Kilmainham Gaol Museum | | |
| Henderson Photographic Archive | Public Record Office of Northern Ireland | | |
| Henehan Letters | University of Galway Archives | | |
| Henry John Allen Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Henry Morris Correspondence | UCD Special Collections | | |
| Herbert Papers | UCD Archives | | |
| Heron and Dobson Papers | Public Record Office of Northern Ireland | | |
| Heron Papers | National Library of Ireland | | |
| Hervey/Bruce Papers | Public Record Office of Northern Ireland | | |
| Hewitt Papers | Public Record Office of Northern Ireland | | |
| Hezlet Papers | Public Record Office of Northern Ireland | | |
| Hibernian Bible Society | Maynooth University and St Patrick's College, Maynooth | | |
| Hibernian Mining Company Papers | National Library of Ireland | | |
| Higginson Papers | Public Record Office of Northern Ireland | | |
| Hillsborough Rural District Council Records | Public Record Office of Northern Ireland | | |
| History General | Kilmainham Gaol Museum | | |
| History IBVM | Loreto Archives | | |
| History of the Old Society | Irish Jesuit Archives | | |
| Hobart Papers | Public Record Office of Northern Ireland | | |
| Hobson Papers | National Library of Ireland | | |
| Hodson Papers | National Library of Ireland | | |
| Holiday Papers | National Library of Ireland | | |
| Holloway Papers | National Library of Ireland | | |
| Holywood Urban District Council Records | Public Record Office of Northern Ireland | | |
| Home Office Records | Public Record Office of Northern Ireland | | |
| Home Rule | Kilmainham Gaol Museum | | |
| Hope Estate Papers | Public Record Office of Northern Ireland | | |
| Horgan Manuscripts | National Library of Ireland | | |
| Houghton Estate Papers | Cork City and County Archives | | |
| House for Fallen Females/Northcote Rescue Home, 1866-1920 | National Archives of Ireland | | |
| House of Industry & House of Industry Hospitals | RCSI Heritage Collections | | |
| House of Industry Register | Limerick Archives | | |
| Housing Committee | Waterford City Archives | | |
| Housing Department | Waterford City Archives | | |
| Housing Weekly Rent Collection Books | Waterford City Archives | | |
| Howard Bury Papers | Public Record Office of Northern Ireland
Westmeath County Archives Department | | |
| HSE Orthopaedic Hospital Oral History Project (d'Orthopaedic) | Cork Folklore Project | https://corkfolklore.org/... | |
| Hugh Kennedy Papers | UCD Archives | | |
| Hugh Lane Additional Papers | National Library of Ireland | | |
| Hugh Lane Gallery | Dublin City Library and Archive | | |
| Hugh Lane Papers | National Library of Ireland | | |
| Hunter of Stewartstown Papers | Public Record Office of Northern Ireland | | |
| Hurley Family Emigrant Letters | Cork City and County Archives | http://catalogue.corkarch... | |
| Hutchins-Joyce | Trinity College Dublin, Manuscripts and Archives Department | | |
| Hutchinson and Synge Hutchinson Papers | UCD Archives | | |
| Hutchinson Papers | National Library of Ireland | | |
| Hutton Papers | Public Record Office of Northern Ireland | | |
| Íde Ní Thuama | Royal Irish Academy | | |
| Illustration Library | RTÉ Stills Library | | |
| Image Archive | Medical Missionaries of Mary Archive | | |
| Important Documents and Letters 1881-1918 | Loreto Archives | | |
| Ina Boyle Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Inchiquin Papers | National Library of Ireland | | |
| Incorporated Society for Promoting Protestant Schools in Ireland | Representative Church Body Library
Trinity College Dublin, Manuscripts and Archives Department | | |
| Incumbered estates/Landed Estates Court | Mayo Local History Department
National Archives of Ireland | | |
| Independent Newspapers (Ireland) Collection | National Photographic Archive | https://catalogue.nli.ie/... | |
| Inishowen Poor Law Union | Donegal County Archives | | |
| Inishowen Rural District Council | Donegal County Archives | | |
| Interviews | Leitrim Local Studies Department | | |
| Irish Actors' Equity Association | UCD Archives | https://www.ucd.ie/archiv... | |
| Irish Agricultural Advisors Organisation | Services Industrial Professional Technical Union (SIPTU) | | |
| Irish Agricultural Organisation Society | National Archives of Ireland | | |
| Irish Art General Files, Women in Art | National Irish Visual Arts Library (NIVAL) | | |
| Irish Artists' Files | National Irish Visual Arts Library (NIVAL) | | |
| Irish Bakers', Confectioners' and Allied Workers' Union | UCD Archives | https://www.ucd.ie/archiv... | |
| Irish Bakers', Confectioners' and Allied Workers' Union, Limerick | UCD Archives | | |
| Irish Ballet Company | Irish Theatre Archive | | |
| Irish Baptist Home and Foreign Mission | Association of Baptist Churches in Ireland | | |
| Irish Christian Fellowship | Representative Church Body Library | | |
| Irish Church Missions | Representative Church Body Library | | |
| Irish Countrywomen's Association | National Library of Ireland | | |
| Irish Crimes Records | National Archives of Ireland | | |
| Irish Directions (Patricia Boylan Papers) | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Irish Distributive and Administrative Trade Union | Mandate Trade Union | | |
| Irish Embroidery Artists | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Irish Estates of A Murray | National Library of Ireland | | |
| Irish Exhibition of Living Art | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Irish Fashion Designers' Files | National Irish Visual Arts Library (NIVAL) | | |
| Irish Fusiliers Records | Public Record Office of Northern Ireland | | |
| Irish Girl Guides | National Archives of Ireland | | |
| Irish Graphical Association | | |
| Irish Guild of Witness | Representative Church Body Library | | |
| Irish Hibernian Athletics Association | Dublin City Library and Archive | | |
| Irish Hockey Association Archive | Dublin City Library and Archive | | |
| Irish Houses | Loreto Archives | | |
| Irish Housewives Association (Hilda Tweedy Papers) | National Archives of Ireland | https://www.nationalarchi... | |
| Irish Jesuit Chaplains in World War I | Irish Jesuit Archives | | |
| Irish Manuscripts | Trinity College Dublin, Manuscripts and Archives Department | | |
| Irish Medical Association | Irish Medical Organisation | | |
| Irish Medical Committee | Irish Medical Organisation | | |
| Irish Mental Hospital Workers Union | UCD Archives | | |
| Irish National Aid and Volunteer Dependants' Fund | National Library of Ireland | | |
| Irish National Land League Papers | National Library of Ireland | | |
| Irish National Union of Vintners', Grocers' and Allied Trades Assistants | Mandate Trade Union | | |
| Irish Nurses' Organisation | Irish Nurses and Midwives Organisation | | |
| Irish Patchwork Society | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Irish Queer Archive | National Library of Ireland | http://www.nli.ie/pdfs/ms... | |
| Irish Republican Army Dublin No 2 Brigade | National Library of Ireland | | |
| Irish Room | Irish Room, County Hall, Coleraine (Closed) | | |
| Irish Shoe and Leather Workers' Union | UCD Archives | https://www.ucd.ie/archiv... | |
| Irish Temperance League Papers | Public Record Office of Northern Ireland | | |
| Irish Tourist Association Topographical and General Survey | Kerry Local Studies and Archives Department
Mayo Local History Department | https://www.kerrylibrary.... | |
| Irish Trade Union Congress | National Archives of Ireland | | |
| Irish Transport and General Workers Union | National Library of Ireland
Services Industrial Professional Technical Union (SIPTU) | | |
| Irish Unionist Alliance Papers | Public Record Office of Northern Ireland | | |
| Irish Volunteers | Kilmainham Gaol Museum | | |
| Irish War of Independence Collection | Dublin City Library and Archive | | |
| Irish Women Workers' Union | Irish Labour History Museum | | |
| Irvinestown Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Irvinestown Rural District Council Records | Public Record Office of Northern Ireland | | |
| Irwin Estate | Sligo Archives Service | | |
| Isaac Butt Papers | National Library of Ireland | | |
| Island and Coast Society papers | Representative Church Body Library | | |
| Ivo De Vesci Photographic Collection | Laois Local Studies | https://laoislocalstudies... | |
| J J Bouch Papers | National Library of Ireland | | |
| J J Hearn Papers | National Library of Ireland | | |
| J J O'Connell Papers | National Library of Ireland | | |
| J. and J. Cooke Papers | Public Record Office of Northern Ireland | | |
| J.C. Walker Papers | Royal Irish Academy | | |
| J.F.X. O'Brien Papers | | |
| J.J. Hearn Papers | National Library of Ireland | | |
| J.J. Walsh TD Collection | Cork City and County Archives | | |
| J.M. Plunkett Papers | National Library of Ireland | | |
| J.P. Corry and Company Papers | Public Record Office of Northern Ireland | | |
| J.R.W. Goulden Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| J.S. Starkey Papers | National Library of Ireland | | |
| J.T. Horne Collection | Cork City and County Archives | | |
| J.W. Boyle Papers | Public Record Office of Northern Ireland | | |
| Jack Lynch Papers | National Archives of Ireland | | |
| Jackie Clarke Collection | Jackie Clarke Repository | https://www.clarkecollect... | |
| Jackson and Whitelaw Papers | Public Record Office of Northern Ireland | | |
| Jacob's Fruitfield Collection | Dublin City Library and Archive | | |
| James Brenan Ms | RCSI Heritage Collections | | |
| James Eagleston Little Donation | Belfast Central Library | | |
| James O'Donovan Papers | National Library of Ireland | | |
| James Roche Correspondence | Cork City and County Archives | | |
| James Ryan Papers | UCD Archives | | |
| James Stephens Papers | National Library of Ireland
Trinity College Dublin, Manuscripts and Archives Department | | |
| James, Earl of Charlemont Correspondence | Royal Irish Academy | | |
| Jane Hamilton's diary of a tour of France and Germany | National Library of Ireland | | |
| Jimmy O'Dea Collection | Irish Theatre Archive | | |
| Joan and Valerie Trimble Papers | Fermanagh County Museum, Enniskillen Castle | | |
| Joe Clarke Papers | National Library of Ireland | | |
| Joesph Campbell | Trinity College Dublin, Manuscripts and Archives Department | | |
| John Arden/Margaretta D'Arcy Collection | University of Galway Archives | | |
| John Coffey, 1889-1904 | Kerry Diocesan Archives (RC) | | |
| John Elliott and Johns Solicitors Papers | Public Record Office of Northern Ireland | | |
| John Fitzgibbon Private Fee Book | Limerick Archives | | |
| John Hewitt Collection | Ulster University Archive & Special Collections, Coleraine Campus | https://guides.library.ul... | |
| John MacErlean SJ research on Mother Catherine McAuley (1778-1841) | Irish Jesuit Archives | | |
| Johns, Elliot and Wallace Papers | Public Record Office of Northern Ireland | | |
| Johnson Papers | Cork City and County Archives | | |
| Joly Collection | National Library of Ireland | | |
| Joly Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Jones Estate | Sligo Archives Service | | |
| Joseph Brennan Papers | National Library of Ireland | | |
| Joseph Campbell Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Joseph Holloway Diaries | | |
| Joseph Holloway Papers | National Library of Ireland | | |
| Joseph McGarrity Papers | National Library of Ireland | | |
| Joseph Smyly Notebook | RCSI Heritage Collections | | |
| Josephine McNeill Papers | National Library of Ireland
UCD Archives | https://www.ucd.ie/archiv... | |
| Journal of the Ardagh and Clonmacnoise Antiquarian Society 1926-37 & 1940-5 | Longford Archives and Local Studies | | |
| Jubilee Nurses | Tipperary Museum of Hidden History | | |
| Justice Day | Royal Irish Academy | | |
| Katherine Tynan Papers | Royal Irish Academy | | |
| Katherine Tynan/Pamela Hinkson Collection | UCD Archives | | |
| Kathleen Boland Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | https://libguides.ucc.ie/... |
| Kathleen Coyle Papers | Tower Museum, Derry-Londonderry | | |
| Kathleen MacKenna Napoli Papers | National Library of Ireland | | |
| Kathleen Mulchrone | Representative Church Body Library | | |
| Kathleen O'Connell Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Kavanagh Collection | UCD Special Collections | | |
| Keady Urban District Council Records | Public Record Office of Northern Ireland | | |
| Kells Poor Law Union | Meath Local Studies and Family History Department | | |
| Kells Rural District Council | Meath Local Studies and Family History Department | | |
| Kelly and D'arcy Deeds | University of Galway Archives | | |
| Kemmis Papers | National Library of Ireland | | |
| Kenmare Papers | Public Record Office of Northern Ireland | | |
| Kenmare Poor Law Union | Kerry Local Studies and Archives Department | | |
| Kenmare Rural District Council | Kerry Local Studies and Archives Department | | |
| Kennedy Papers | Public Record Office of Northern Ireland | | |
| Kent Papers | National Library of Ireland | | |
| Ker Papers | Public Record Office of Northern Ireland | | |
| Kerry Board of Health Records | Kerry Local Studies and Archives Department | | |
| Kerry County Council | Kerry Local Studies and Archives Department | | |
| Kerry Grand Jury Presentments | Kerry Local Studies and Archives Department | | |
| Kerry Protestant Orphan Society | Representative Church Body Library | | |
| Kevin Barry Collection | UCD Archives | | |
| Kevin Street Library Collection | Dublin City Library and Archive | | |
| Kilbeggan Rural District Council | Westmeath County Archives Department | | |
| Kildare Board of Health Records | Kildare Local Studies, Genealogy and Archives Department | https://kildarecoco.ie/Li... | |
| Kildare County Council | Kildare Local Studies, Genealogy and Archives Department | | |
| Kildare County Library: Teresa Brayton Papers | National Library of Ireland | | |
| Kildare Grand Jury Records | Kildare Local Studies, Genealogy and Archives Department | https://kildarecoco.ie/Li... | |
| Kilkee Town Commissioners | Clare County Archives | | |
| Kilkeel Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Kilkeel Rural District Council Records | Public Record Office of Northern Ireland | | |
| Kilkeel Urban District Council Records | Public Record Office of Northern Ireland | | |
| Kilkenny Corporation | Kilkenny Local Studies Department | | |
| Kilkenny Design Workshop | National Irish Visual Arts Library (NIVAL) | http://www.nival.ie/colle... | |
| Kilkenny Grand Jury Records | Kilkenny Local Studies Department | | |
| Kilkenny Poor Law Union | Kilkenny Local Studies Department | | |
| Kilkenny Rural District Council | Kilkenny Local Studies Department | | |
| Killadysert Rural District Council | Clare County Archives | | |
| Killala Estate | Sligo Archives Service | | |
| Killala Poor Law Union | National Library of Ireland | | |
| Killarney Poor Law Union | Kerry Local Studies and Archives Department | | |
| Killarney Rural District Council | Kerry Local Studies and Archives Department | | |
| Killen Papers | Public Record Office of Northern Ireland | | |
| Killiney-Ballybrack | Dún Laoghaire-Rathdown County Council | https://www.dlrcoco.ie/si... | |
| Kilmacthomas Poor Law Union | Waterford County Archives | | |
| Kilmainham Papers | National Library of Ireland | | |
| Kilmallock Poor Law Union | Limerick Archives | | |
| Kilmore Diocesan Archives | Kilmore Diocesan Archives (RC) | | |
| Kilmore District Dispensary | UCD Archives | https://www.ucd.ie/archiv... | |
| Kilmorey Papers | Public Record Office of Northern Ireland | | |
| Kilpatrick Solicitors' Papers | Public Record Office of Northern Ireland | | |
| Kilrush Poor Law Union | Clare County Archives | | |
| Kilrush Rural District Council | Clare County Archives | | |
| Kilrush Urban District Council | Clare County Archives | | |
| King Estate | Sligo Archives Service | | |
| King's Hospital Records | King's Hospital School | | |
| King-Harman Estate | Longford Archives and Local Studies | | |
| King-Harmon Papers | National Archives of Ireland | | |
| Kinghan Papers | Public Record Office of Northern Ireland | | |
| Kings and Queens College of Physicians | Royal College of Physicians of Ireland | | |
| Kingstown/Dún Laoghaire | Dún Laoghaire-Rathdown County Council | https://www.dlrcoco.ie/si... | |
| Kinlough Rural District Council | Leitrim Local Studies Department | | |
| Kirkpatrick Biographical Archive | Royal College of Physicians of Ireland | | |
| Kirkpatrick Papers | Public Record Office of Northern Ireland | | |
| Kirwan House | Representative Church Body Library | | |
| Kitty Kiernan Papers | National Library of Ireland | | |
| Knight of Glin Collection | OPW-Maynooth University Archive and Research Centre (OMARC) | | |
| Knox Papers | Public Record Office of Northern Ireland | | |
| L'Estrange & Brett Solicitors' Papers | Public Record Office of Northern Ireland | | |
| L'Estrange and Brett Solicitors Papers | Public Record Office of Northern Ireland | | |
| L'Estrange and Brett Solicitors' Papers | Public Record Office of Northern Ireland | | |
| L.C. Beaufort | Royal Irish Academy | | |
| La Touche-Tottenham Papers | National Library of Ireland | | |
| Laban Traditional Music Collection | Clare County Archives | https://clarelibrary.foto... | |
| Labatt's Fee Books | RCSI Heritage Collections | | |
| Labour | Kilmainham Gaol Museum | | |
| Labour Party Archive | National Library of Ireland | https://catalogue.nli.ie/... | |
| Labourers (Ireland) Acts Minute Book | Offaly Archives | | |
| Ladies' Irish Association | Representative Church Body Library | | |
| Lady Dorothy Lowry-Corry Papers | Fermanagh County Museum, Enniskillen Castle | | |
| Lady Eliza Deane Papers | Cork City and County Archives | https://corkarchives.ie/e... | |
| Lady Elizabeth Pack | Representative Church Body Library | | |
| Lady Holland Papers | Public Record Office of Northern Ireland | | |
| Lady Moira Papers | Public Record Office of Northern Ireland | | |
| Lady Spender Papers | Public Record Office of Northern Ireland | | |
| Lady Theresa Londonderry Papers | Public Record Office of Northern Ireland | | |
| Lalor Papers | National Library of Ireland | | |
| Lamb Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Lámhscríbhinní de hÍde | University of Galway Archives | | |
| Land League Papers | National Library of Ireland | | |
| Land War | Kilmainham Gaol Museum | | |
| Lane and Boyle Papers | Public Record Office of Northern Ireland | | |
| Lane Papers | National Library of Ireland | | |
| Language Freedom Movement | University of Galway Archives | | |
| Laois County Council | Laois Local Studies | | |
| Laois County Council Photographic Collection | Laois Local Studies | https://laoislocalstudies... | |
| Laois Local Authority Records | Laois Local Studies | | |
| Larcom Papers | | |
| Larne Board of Guardian Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Larne Borough Council Records | Ballymena Central Library | | |
| Larne Rural District Council Records | Public Record Office of Northern Ireland | | |
| Larne Urban District Council Records | Public Record Office of Northern Ireland | | |
| Lawrence and Steele Papers | Public Record Office of Northern Ireland | | |
| Lawrence Photographic Collection | National Photographic Archive | https://www.nli.ie/en/udl... | |
| Le Brocquy Papers | National Library of Ireland | | |
| Le Fanu Papers | National Library of Ireland | | |
| Leadbeater Papers | National Library of Ireland | | |
| Lecky Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Legg (Synge) Deposit | Trinity College Dublin, Manuscripts and Archives Department | | |
| Leinster Papers | National Library of Ireland
Public Record Office of Northern Ireland | | |
| Leinster Quarterly Meetings | Religious Society of Friends in Ireland Historical Library | | |
| Leitrim County Council | Leitrim Local Studies Department | | |
| Leitrim County Infirmary | Leitrim Local Studies Department | | |
| Leitrim Papers | National Library of Ireland | | |
| Lenigan-Evans Papers | National Archives of Ireland | | |
| Lennon Papers | National Library of Ireland | | |
| Lennox and Dolly Robinson Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Lenox-Conyngham Papers | Public Record Office of Northern Ireland | | |
| Leslie Papers | Public Record Office of Northern Ireland | | |
| Leslie Papers | National Library of Ireland | | |
| Letter book of G. O'Malley-Ormsby of Ballina | University of Galway Archives | | |
| Letter from Hilary Rodham Clinton | University of Galway Archives | | |
| Letter of John O'Leary to Miss Mulligan | University of Galway Archives | | |
| Letter of Liam Mellows to his mother | University of Galway Archives | | |
| Letterkenny Poor Law Union | Donegal County Archives | | |
| Letterkenny Rural District Council | Donegal County Archives | | |
| Letterkenny Urban District Council | Donegal County Archives | https://www.donegalcoco.i... | |
| Letters and papers of the family of Eusaby Cleaver | Representative Church Body Library | | |
| Letters and papers of the Ussher family | Representative Church Body Library | | |
| Letters and papers relating to the 'Church of Ireland Diocesan Libraries', | Representative Church Body Library | | |
| Letters from An Craoibhín | University of Galway Archives | | |
| Letters from Count Baserot to the Fays of New York | University of Galway Archives | | |
| Letters from Fr Albert to Eva Gore-Booth | National Library of Ireland | | |
| Letters from India 1848-1860 | Loreto Archives | | |
| Letters from Lulu to Miss Rosa Butt, 1875 | National Archives of Ireland | | |
| Letters of Piaras Beaslaí to Eibhlís Grimes | University of Galway Archives | | |
| Letters of William Alexander, and his wife | Representative Church Body Library | | |
| Letters to John Jebb, Bishop of Limerick | Representative Church Body Library | | |
| Letters to Kate Kelly on Irish political prisoners | National Library of Ireland | | |
| Letters to M.M. Teresa Ball from the Family and Relatives | Loreto Archives | | |
| Letters to members of the family of Lord Justice Fitzgerald | National Library of Ireland | | |
| Letters to William Patrick Carmody, Dean of Down 1923-38 | Representative Church Body Library | | |
| Letters: Generalate to Ireland (1806 to 1959) | Irish Jesuit Archives | | |
| Leveson Gower Letter Books | National Archives of Ireland | | |
| Levinge Papers | Public Record Office of Northern Ireland | | |
| LGBT Collection | Cork Folklore Project | https://corkfolklore.org/... | |
| Liam de Róiste Collection | Cork Public Museum | | |
| Liam de Róiste Correspondence | Cork City and County Archives | | |
| Liam Ó Buachalla Papers | Cork City and County Archives | | |
| Life Journeys: Living Folklore in Ireland Today | Cork Folklore Project | https://corkfolklore.org/... | |
| Lifford Endowed Schools Collection | Donegal County Archives | | |
| Lily O'Brennan | UCD Archives | | |
| Lily Williams Papers | National Library of Ireland | | |
| Limavady Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Limavady Rural District Council Records | Public Record Office of Northern Ireland | | |
| Limavady Urban District Council Records | Public Record Office of Northern Ireland | | |
| Limerick Chamber of Commerce | Limerick Archives | | |
| Limerick City Council Minute Books | Limerick Archives | https://www.limerick.ie/d... | |
| Limerick Corporation | Limerick Archives | | |
| Limerick Council Special Meeting Minute Books | Limerick Archives | https://www.limerick.ie/d... | |
| Limerick County Council | Limerick Archives | | |
| Limerick Monthly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| Limerick Papers | National Library of Ireland | | |
| Limerick Poor Law Union | Limerick Archives | | |
| Linda Hills | Representative Church Body Library | | |
| Lindsay Papers | National Library of Ireland | | |
| Lisburn Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Lisburn Borough Council Records | Public Record Office of Northern Ireland | | |
| Lisburn Rural District Council Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Lismore and Related Documents | Tipperary Museum of Hidden History | | |
| Lismore Castle Papers | Waterford County Archives | https://www.waterfordcoun... | |
| Lismore Local Authority Records | National Archives of Ireland | | |
| Lismore Papers | National Library of Ireland | | |
| Lismore Poor Law Union | National Archives of Ireland
Waterford County Archives | | |
| Lismore Rural District Council | National Archives of Ireland
Waterford County Archives | | |
| Lisnaskea Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Lisnaskea Rural District Council Records | Public Record Office of Northern Ireland | | |
| Lissadell Papers | Public Record Office of Northern Ireland | | |
| Listowel Papers | Kerry Local Studies and Archives Department | | |
| Listowel Poor Law Union | Kerry Local Studies and Archives Department | | |
| Listowel Rural District Council | Kerry Local Studies and Archives Department | | |
| Lloyd Estate | Sligo Archives Service | | |
| Local Authority Records | Belfast Central Library
Clare County Archives
Fingal County Archive
Louth County Archives
Mayo Local History Department
Sligo Archives Service
Wexford County Archive
Wicklow Library and Archives | | |
| Local Government Board | Public Record Office of Northern Ireland
Sligo Archives Service | | |
| Local History Department | Ulster Museum, Belfast | | |
| Local Studies Collection | Omagh Library
South Eastern Education and Library Board Local History Collection | | |
| Lodge's Manuscripts | National Archives of Ireland | | |
| Londonderry Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Londonderry Borough City Council Records | Public Record Office of Northern Ireland | | |
| Londonderry County Council Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Londonderry Estate Office Papers | Public Record Office of Northern Ireland | | |
| Londonderry Papers | Public Record Office of Northern Ireland | | |
| Londonderry Rural District Council Records | Donegal County Archives
Public Record Office of Northern Ireland | | |
| Longfield Beatty Papers | Cork City and County Archives | | |
| Longfield Roberts Entomological Library | Royal Irish Academy | | |
| Longfield, Kelly and Armstrong Papers | Public Record Office of Northern Ireland | | |
| Longford Irish Countrywomen's Association (ICA) Papers | Longford Archives and Local Studies | https://www.longfordlibra... | |
| Longford Poor Law Union Records | Longford Archives and Local Studies | | |
| Longford Urban District Council Records | Longford Archives and Local Studies | | |
| Longford-Westmeath Joint Library Committee | Westmeath County Archives Department | | |
| Looney Collection | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | |
| Lord Walter Fitzgearld Papers | National Library of Ireland | | |
| Lord William Beresford | National Archives of Ireland | | |
| Loreto Abbey Rathfarnham, South Africa. | Loreto Archives | | |
| Lough (Cairncastle) Papers | Public Record Office of Northern Ireland | | |
| Loughrea Poor Law Union Records | Galway County Council Archives | | |
| Loughrea Rural District Council | Galway County Council Archives | | |
| Loughrea Social and Literary Club | University of Galway Archives | | |
| Loughton Papers | Offaly Archives | | |
| Louth County Library | Louth County Archives | | |
| Louth Grand Jury Records | Louth County Archives | | |
| Louth Papers | National Library of Ireland | | |
| Louth Rural District Council | Louth County Archives | | |
| Lowry, Cleland, Steele and Nicholson Papers | Public Record Office of Northern Ireland | | |
| Lucan Papers | University of Galway Archives | | |
| Ludlow Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Luke Cullen Papers | National Library of Ireland | | |
| Lurgan Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Lurgan Borough Council Records | Public Record Office of Northern Ireland | | |
| Lurgan Rural District Council Records | Public Record Office of Northern Ireland | | |
| Lyons Photographic Collection | Mayo Local History Department | https://library.mayo.ie/m... | |
| Lyric Theatre/ O'Malley Archive | University of Galway Archives | | |
| M.J. Dolan Papers | National Library of Ireland | | |
| M.M. Gonzaga Barry 1881-1899 | Loreto Archives | | |
| M.M. Pauline Dunne 1948-1968 | Loreto Archives | | |
| M.M. Raphael Deasy, Australia | Loreto Archives | | |
| M.M. Teresa Ball | Loreto Archives | | |
| Macartney Papers | Public Record Office of Northern Ireland | | |
| MacGeough Bond Papers | Public Record Office of Northern Ireland | | |
| MacIomhair Papers | National Library of Ireland | | |
| Mackemie Papers | Public Record Office of Northern Ireland | | |
| MacMahon Collection | Kilmainham Gaol Museum | | |
| Macnas - Spectacle and Street Theatre Company | University of Galway Archives | | |
| Madden Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Madeleine Townshend of Ballsbridge | Representative Church Body Library | | |
| Maeve Binchy Papers | UCD Special Collections | https://libguides.ucd.ie/... | |
| Maeve Cavanagh MacDowell Papers | National Library of Ireland | | |
| Magdalen Asylum, Dublin | Representative Church Body Library | | |
| Magherafelt Board of Guardian Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Magherafelt District Council Records | Ballymena Central Library | | |
| Magherafelt Rural District Council Records | Public Record Office of Northern Ireland | | |
| Mahon Papers | National Library of Ireland | | |
| Maids of the Mountain Hockey Club | Dublin City Library and Archive | | |
| Máire Áine Ní Dhonnchadha Collection | Irish Traditional Music Archive/ Taisce Ceoil Dúchais Éireann | | |
| Máire Comerford Papers | National Library of Ireland | | |
| Máire Ní Shuibhne Brugha Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Máire Nic Shiubhlaigh Papers | National Library of Ireland | | |
| Mairéad McDonagh Papers | University of Galway Archives | | |
| Máirín Ní Mhuirgheasa Papers | National Library of Ireland | | |
| Malcolm Papers | Public Record Office of Northern Ireland | | |
| Manorhamilton Poor Law Union | Leitrim Local Studies Department | | |
| Manorhamilton Rural District Council | Leitrim Local Studies Department | | |
| Mansfield Papers | National Library of Ireland | | |
| Mansion House Fund for Relief of Distress in Ireland | Dublin City Library and Archive | https://www.dublincity.ie... | |
| Manuscript lives of early members | Loreto Archives | | |
| Manuscripts relating to Pauline Henley | Cork City and County Archives | https://publications.cork... | |
| Margaret Dobbs Papers | Public Record Office of Northern Ireland | | |
| Margaret MacDonnell Papers (deposit) | Royal Irish Academy | | |
| Margaret McDonnell Letters | University of Galway Archives | | |
| Margaret Stokes | Representative Church Body Library
Royal Irish Academy | | |
| Maria Edgeworth application for assistance | National Library of Ireland | | |
| Maria Edgeworth Collection | Longford Archives and Local Studies | | |
| Maritime Collections | Tower Museum, Derry-Londonderry | | |
| Mark Cassidy Papers | Public Record Office of Northern Ireland | | |
| Martin and Henderson Solicitors Papers | Public Record Office of Northern Ireland | | |
| Martin Conlon Papers | UCD Archives | | |
| Mary Hayden Papers | National Library of Ireland | | |
| Mary Hutton Papers | National Library of Ireland | | |
| Mary Lavin Papers | UCD Special Collections | https://libguides.ucd.ie/... | https://www.ucd.ie/specia... |
| Mary MacSwiney Papers | UCD Archives | | |
| Mary Robinson Collection | University of Galway Archives | | |
| Mary Spring Rice Papers | UCD Archives | https://www.ucd.ie/archiv... | https://www.ucd.ie/archiv... |
| Mary Ward Documents | Loreto Archives | | |
| Maryborough District Lunatic Asylum | Laois Local Studies | | |
| Masonic Female Orphan School | Grand Lodge of Freemasons of Ireland | | |
| Maternity and Child Welfare Committee | Waterford City Archives | | |
| Matheson, Ormsby & Prentice solicitors | National Archives of Ireland | | |
| Mathew O'Mahony Papers | National Library of Ireland | | |
| Matthew Murtagh Collection | Irish Theatre Archive | | |
| Maureen Wall Collection | Donegal County Archives | | |
| Maxwell Given Papers | Public Record Office of Northern Ireland | | |
| May Craig Collection | UCD Archives | https://www.ucd.ie/archiv... | |
| Mayo Board of Health | Mayo Local History Department | | |
| Mayo County Council | Mayo Local History Department | | |
| Mayo Estate Rentals | Mayo Local History Department | https://www.mayo.ie/libra... | |
| Mayo Papers | National Library of Ireland | | |
| McCabe Papers | Ardagh and Clonmacnoise Diocesan Archives (RC)
Dublin Diocesan Archives (RC) | | |
| McCall Papers | National Library of Ireland | | |
| McCance Papers | Public Record Office of Northern Ireland | | |
| McCormick Papers | Public Record Office of Northern Ireland | | |
| McCormick, Joan E and others | Royal Irish Academy | | |
| McDonnell Family Papers | UCD Archives | | |
| McFarland Papers | Public Record Office of Northern Ireland | | |
| McGiffert Papers | Public Record Office of Northern Ireland | | |
| McGildowney Papers | Public Record Office of Northern Ireland | | |
| McIlwrath and Wallace Papers | Public Record Office of Northern Ireland | | |
| McKenna Papers | Public Record Office of Northern Ireland | | |
| McKinney Papers | Public Record Office of Northern Ireland | | |
| McLaughlin and Sons Papers | Public Record Office of Northern Ireland | | |
| McLaughlin Papers | Public Record Office of Northern Ireland | | |
| McLees Papers | Public Record Office of Northern Ireland | | |
| McMahon Collection | Kilmainham Gaol Museum | | |
| McMillan, Nora F Bequest | Royal Irish Academy | | |
| McNeill (Cushendun) Papers | Public Record Office of Northern Ireland | | |
| McPeake Papers | Public Record Office of Northern Ireland | | |
| Meath County Board of Health | Meath Local Studies and Family History Department | | |
| Meath Diocesan Registry | National Archives of Ireland | | |
| Meath Local Authority Records | Meath Local Studies and Family History Department | | |
| Meath Protestant Orphan Society | Representative Church Body Library | | |
| Medical Union | Irish Medical Organisation | | |
| Megaw Collection | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | https://www.qub.ac.uk/dir... |
| Memoir by Kathleen Barnwell, Birr | Offaly Archives | | |
| Memoir of Mahrea Lehman | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Memoirs of the Countess de Boisserie | University of Galway Archives | | |
| Memorabilia, Seamus de Burca | Irish Theatre Archive | | |
| Mendicity Institute | National Library of Ireland | | |
| Mercer School Photographs | King's Hospital School | | |
| Mercer School Records | National Archives of Ireland | | |
| Mercer's 250 Anniversary | King's Hospital School | | |
| Mercer's Hospital Archive | RCSI Heritage Collections | | |
| Mercer's School | King's Hospital School | | |
| Meredith Estate | Sligo Archives Service | | |
| Methodist Church Records | Public Record Office of Northern Ireland | | |
| Michael Collins Papers | UCD Archives | | |
| Michael Gill Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Michael Hayes Papers | UCD Archives | | |
| Michael J. Dolan | Irish Theatre Archive | | |
| Michael MacDonagh Papers | National Library of Ireland | | |
| Michael McDunphy Papers | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Michael Moynihan Papers | UCD Archives | | |
| Michael Murphy Clonmel Images, 1970s | Tipperary Studies | https://tipperarystudies.... | |
| Michael O'Brien, 1927-1952 | Kerry Diocesan Archives (RC) | | |
| Michael Tierney Papers | UCD Archives | | |
| Michael Walsh Asylum | Waterford City Archives | | |
| Microfilm Collections | Limerick Archives | | |
| Midleton Estate Papers | Public Record Office of Northern Ireland | | |
| Midwives Committee | Waterford City Archives | | |
| Milford Poor Law Union | Donegal County Archives | | |
| Milford Rural District Council | Donegal County Archives | | |
| Military Service Pensions Collection | Military Archives | https://www.militaryarchi... | |
| Ministry of Health and Local Government Records | Public Record Office of Northern Ireland | | |
| Minute Book of the County Galway Hunt | University of Galway Archives | | |
| Minute Books of Galway Town Commissioners | University of Galway Archives | | |
| Minute Books of Galway Urban District Council | University of Galway Archives | | |
| Minute Books of the Committee of Management of Dispensary Districts | Offaly Archives | | |
| Minute Books Waterford County Council and City Red Cross Society | Waterford City Archives | | |
| Minutes of General Chapters | Loreto Archives | | |
| Minutes of Tullamore Lawn Tennis Club | Offaly Archives | | |
| Miontuarascai Scoil Eigse | University of Galway Archives | | |
| Miscellaneous | Kerry Diocesan Archives (RC)
Queen's University Belfast Special Collections and Archives
Roscommon Local Studies and Archives | | |
| Miscellaneous Local Authority Records | | |
| Miscellaneous Records, Leitrim | Leitrim Local Studies Department | | |
| Miss Carr's Children's Home | National Archives of Ireland | | |
| Miss E. Summers | Representative Church Body Library | | |
| Miss Eve Jellett | Representative Church Body Library | | |
| Miss Hilda Caroline Gregg | Representative Church Body Library | | |
| Miss O'Rorke | Representative Church Body Library | | |
| Moate Monthly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| Mohill Poor Law Union | Leitrim Local Studies Department | | |
| Mohill Rural District Council | Leitrim Local Studies Department | | |
| Moira Rural District Council Records | Public Record Office of Northern Ireland | | |
| Molyneux Home for the Blind | National Archives of Ireland | | |
| Monaghan District Lunatic Asylum | St Davnet's Hospital, Monaghan | | |
| Monaghan Urban District Council | Monaghan County Library Genealogy and Local History Department | | |
| Monck Papers | National Library of Ireland | | |
| Monsell of Tervoe Papers | National Library of Ireland | | |
| Monteagle Papers | Limerick Archives
National Library of Ireland | | |
| Montgomery of Benvarden Papers | Public Record Office of Northern Ireland | | |
| Montgomery Papers | Public Record Office of Northern Ireland | | |
| Moorehead Letters | Monaghan County Museum | | |
| Moravian Church Records | Public Record Office of Northern Ireland | | |
| Morgan's School | King's Hospital School | | |
| Moss Twomey Papers | UCD Archives | | |
| Most Reverend John Dixon Archive | Armagh Diocesan Archive (RC) | | |
| Most Reverend Patrick Curtis Archive | Armagh Diocesan Archive (RC) | | |
| Most Reverend Richard Reilly Archive | Armagh Diocesan Archive (RC) | | |
| Mother Mary Joseph Lemass, PO plays and papers | Irish Theatre Archive | | |
| Mother Mary Potter, Foundress | Little Company of Mary Sisters | | |
| Mothers' Union Collection | Representative Church Body Library | | |
| Mount Argus, Christian Doctrine Society | Passionist Congregation | | |
| Mount Argus, Women's Confraternity | Passionist Congregation | | |
| Mountaineering Ireland, Joss Lynam | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Mountainstown Documents | Meath Local Studies and Family History Department | | |
| Mountbellew Poor Law Union | Galway County Council Archives | | |
| Mountmellick Monthly Monthly Meetings | Religious Society of Friends in Ireland Historical Library | | |
| Mountmellick Poor Law Union | Laois Local Studies | | |
| Mountmellick Rural District Council | Laois Local Studies | | |
| Mountmellick Town Commissioners | Laois Local Studies | | |
| Movement for the Parliamentary Enhancement of Women | Maynooth University and St Patrick's College, Maynooth | | |
| Moyle District Council | Ballymena Central Library | | |
| Mrs Frances Woodman, poetry | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Mrs Mary S Kettle | Representative Church Body Library | | |
| Mrs Smyly's Homes | Representative Church Body Library | | |
| Mrs Sydney Czira papers | | |
| Mrs William O'Brien's papers | National Library of Ireland | | |
| Ms1 | Archbishop Marsh's Library | | |
| Muckross Hockey Club | Dublin City Library and Archive | | |
| Muintir na Tíre | University of Galway Archives | | |
| Mulcahy Papers | Limerick Archives | | |
| Mullingar Poor Law Union | Westmeath County Archives Department | | |
| Mullingar Rural District Council | Westmeath County Archives Department | | |
| Mullingar Town Commissioner | Westmeath County Archives Department | | |
| Mulvihill Papers | UCD Archives | | |
| Munster Quarterly Meeting | Religious Society of Friends in Ireland Historical Library | | |
| Murphy Brewery Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Murphy Memoirs | Cork City and County Archives | | |
| Murray family of Mountmurray, County Donegal, papers | National Library of Ireland | | |
| Murray of Broughton Papers | Public Record Office of Northern Ireland | | |
| Murray Papers | Dublin Diocesan Archives (RC) | | |
| Murray Stewart South Donegal Estate Survey and Rentals | Donegal County Archives | https://www.donegalcoco.i... | |
| Muschamp Papers | National Library of Ireland | | |
| Museum Collection | Religious Society of Friends in Ireland Historical Library | | |
| Mussenden Papers | Public Record Office of Northern Ireland | | |
| Myles Papers | Public Record Office of Northern Ireland | | |
| Naas Poor Law Union | Kildare Local Studies, Genealogy and Archives Department | | |
| Naas Urban District Council | Kildare Local Studies, Genealogy and Archives Department | | |
| Nancy McCarthy Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| National Board for Nursing Records | Public Record Office of Northern Ireland | | |
| National Dance Archives of Ireland | University of Limerick Special Collections and Archives | https://www.ul.ie/library... | |
| National School Archives | Cork City and County Archives | https://corkarchives.ie/e... | |
| National Schools, Private Accessions | National Archives of Ireland | | |
| National Union of Journalist Papers | National Union of Journalists
Public Record Office of Northern Ireland | | |
| National Union of Tailors and Garment Workers | National Archives of Ireland | | |
| National University of Ireland | National University of Ireland | | |
| National University Women Graduates Association | UCD Archives | | |
| Navan Poor Law Union | Meath Local Studies and Family History Department | | |
| Navan Rural District Council | Meath Local Studies and Family History Department | | |
| Navan Urban District Council | Meath Local Studies and Family History Department | | |
| Neilí Ní Dhomhnaill Collection | Irish Traditional Music Archive/ Taisce Ceoil Dúchais Éireann | | |
| Nenagh Poor Law Union | Tipperary Studies | | |
| Nenagh Rural District Council | Tipperary Studies | | |
| Nenagh Young Men's Christian and Literary Association | Representative Church Body Library | | |
| Neville Papers | National Library of Ireland | | |
| New Ross Poor Law Union | Wexford County Archive | | |
| New Ross Rural District Council | Kilkenny Local Studies Department | | |
| Newbridge Town Commissioners | Kildare Local Studies, Genealogy and Archives Department | | |
| Newcastle Urban District Council Records | Public Record Office of Northern Ireland | | |
| Newcastlewest Poor Law Union | Limerick Archives | | |
| Newport Manuscripts | Queen's University Belfast Special Collections and Archives | | |
| Newport Poor Law Union | National Library of Ireland | | |
| Newry and Mourne District Council Records | Newry City Library | | |
| Newry Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Newry Rural District Council Records | Public Record Office of Northern Ireland | | |
| Newry Urban District Council Records | Public Record Office of Northern Ireland | | |
| Newtownabbey Borough Council Records | Ballymena Central Library | | |
| Newtownabbey Urban District Council Records | Ballymena Central Library
Public Record Office of Northern Ireland | | |
| Newtownards Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Newtownards Borough Council Records | Public Record Office of Northern Ireland | | |
| Newtownards Rural District Council Records | Public Record Office of Northern Ireland | | |
| Nicholson Papers | Public Record Office of Northern Ireland | | |
| Nora Wallace Collection | Cork Public Museum | | |
| Norman Carrothers Papers | Ulster University Archive & Special Collections, Coleraine Campus | https://www.rascal.ac.uk/... | |
| North Dublin Poor Law Union | Fingal County Archive | | |
| North Dublin Poor Law Union and Rural District Council | National Archives of Ireland | | |
| North Dublin Rural District Council Records | Fingal County Archive | | |
| North Infimary Hospital Board and Committee Minutes | Cork City and County Archives | http://catalogue.corkarch... | |
| North Tipperary Cancelled Valuation Books | Tipperary Studies | https://www.tippstudiesdi... | |
| Northern Ireland Cabinet Conclusions | Public Record Office of Northern Ireland | | |
| Northern Ireland Cabinet Papers | Public Record Office of Northern Ireland | | |
| Northern Ireland Cabinet Secretariat Papers | Public Record Office of Northern Ireland | | |
| Northern Ireland Curriculum Council Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Government Information Service Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Hospitals Authority Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Labour Party Papers | Public Record Office of Northern Ireland | | |
| Northern Ireland Ministry of Commerce Papers | Public Record Office of Northern Ireland | | |
| Northern Ireland Ministry of Education Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Ministry of Finance Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Ministry of Health and Social Services Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Ministry of Home Affairs Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Ministry of Labour Records | Public Record Office of Northern Ireland | | |
| Northern Ireland Political Collection | Linen Hall Library | | |
| Northern Ireland Women Artists' Group | National Irish Visual Arts Library (NIVAL) | | |
| Northern Ireland Women's Coalition | Linen Hall Library | | |
| Northland (Digital Film Collection) | Tower Museum, Derry-Londonderry | | |
| Notebook of Edith OEnone Somerville | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Nugent Papers | Public Record Office of Northern Ireland | | |
| NUI Galway Department of History | University of Galway Archives | | |
| Nutall Papers | National Library of Ireland | | |
| Ó Cianán Medical Manuscript | University of Galway Archives | | |
| O' Donovan Rossa Papers | National Library of Ireland | | |
| O'Beirne Papers | National Library of Ireland | | |
| O'Brennan Family Papers | Offaly Archives | | |
| O'Brien Family | Trinity College Dublin, Manuscripts and Archives Department | | |
| O'Bryne Papers | National Library of Ireland | | |
| O'Callaghan-Westropp Papers | UCD Archives | | |
| O'Connell Papers | National Library of Ireland
UCD Archives | | |
| O'Connell Solicitors | Kerry Local Studies and Archives Department | | |
| O'Connor Donelan Papers | University of Galway Archives | | |
| O'Donovan Rossa Papers | National Library of Ireland | | |
| O'Hagan Papers | Public Record Office of Northern Ireland | | |
| O'Hara Papers | National Library of Ireland | | |
| O'Lochlainn Collection | UCD Special Collections | | |
| O'Loghlen Papers | National Library of Ireland | | |
| O'Malley of Castlebar Papers | University of Galway Archives | | |
| O'Mullane Papers | National Library of Ireland | | |
| O'Rahilly Papers | UCC Special Collections & Archives | | |
| O'Reilly Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| O'Sullivan/Solomons Collection | Trinity College Dublin, Manuscripts and Archives Department | | |
| O'Sullivan/Solomons Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Offaly Protestant Orphan Society | Representative Church Body Library | | |
| Office of the Governor General | National Archives of Ireland | | |
| Official Papers | National Archives of Ireland | | |
| Ogilvie and Moore, Provisioners | Cork City and County Archives | | |
| Oldcastle Poor Law Union | Meath Local Studies and Family History Department | | |
| Ollchruinniu Scoileanna Eigse & Seanchas | University of Galway Archives | | |
| Olympia and Gate Theatres | Irish Theatre Archive | | |
| Olympia Theatre | Irish Theatre Archive | | |
| Omagh Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Omagh Rural District Council Records | Public Record Office of Northern Ireland | | |
| Omagh Urban District Council Records | Public Record Office of Northern Ireland | | |
| Operatives Bakers | UCD Archives | | |
| OPW Management | Kilmainham Gaol Museum | | |
| Oral History Projects | UCC College Archives
University of Galway Archives | | |
| Orchard Gallery Collection | Tower Museum, Derry-Londonderry | | |
| Ormonde Papers | National Library of Ireland | | |
| Ormsby of Ballinamore Collection | University of Galway Archives | | |
| Osborne Papers | National Archives of Ireland | | |
| Other School and Educational Institution Archives | Cork City and County Archives | https://corkarchives.ie/e... | |
| Otway Papers | National Library of Ireland | | |
| Our Lady's Hospital, Cork | Our Lady's Hospital, Cork | http://catalogue.corkarch... | |
| Outrage Papers, 1832-1852 | National Archives of Ireland | | |
| P.J. Brennan | UCD Archives | | |
| P.J. Smyth Papers | National Library of Ireland | | |
| Pack-Beresford Papers | Public Record Office of Northern Ireland | | |
| Paipeiri Stiophain Bairead | University of Galway Archives | | |
| Pakenham-Mahon Papers | National Library of Ireland | | |
| Pan Pan Theatre Collection | University of Galway Archives | | |
| Papers of Brother John Conway, SJ (1920 to 1977) | Irish Jesuit Archives | | |
| Papers of Caitlín Bean Cathal Brugha | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Colonel Philip Doyne Vigors, 1826-1979 | National Archives of Ireland | | |
| Papers of Dr Croke | Cashel and Emly Diocesan Archives (RC) | | |
| Papers of Dr Daniel Delany, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr Edward Nolan, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr Francis Haly, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr James Doyle, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr James Lynch, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr James Walshe, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr Kathleen Farrell (née Murphy) | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Dr Michael Corcoran, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr Patrick Foley, Bishop of Kildare & Leighlin | Delany Archive | https://www.delanyarchive... | |
| Papers of Dr T. Bray, Archbishop of Cashel and Emly, 1792-1820 | Cashel and Emly Diocesan Archives (RC) | | |
| Papers of Edward Hill | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers of Evelyn Gleeson and the Dun Emer Guild | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers of Fr Joseph Hurley | Offaly Archives | | |
| Papers of Fr Leonard Sheils (1897 to 1968) | Irish Jesuit Archives | | |
| Papers of Fr Matthew Russell, SJ (1834 - 1912) | Irish Jesuit Archives | | |
| Papers of Fr Patrick J. Connolly, SJ (1875 to 1951) | Irish Jesuit Archives | | |
| Papers of Fr Peter Finlay, SJ (1851 - 1929) | Irish Jesuit Archives | | |
| Papers of Fr Robert St Leger, SJ (1788 to 1856) | Irish Jesuit Archives | | |
| Papers of Fr Roland Burke Savavge, SJ (1912 -1998) | Irish Jesuit Archives | | |
| Papers of Fr Swayne | Offaly Archives | | |
| Papers of Fr Thomas A Finlay, SJ (1848-1940) | Irish Jesuit Archives | | |
| Papers of Fr William A Sutton, SJ (1847 to 1922) | Irish Jesuit Archives | | |
| Papers of Fr. Peter Finlay, SJ (1851 - 1929) | Irish Jesuit Archives | | |
| Papers of Françoise Henry | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Frank Gallagher (1893-1962) and Cecilia Saunders (1889-1967) | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers of George Boole | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Papers of Hubert Butler and Peggy Butler | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers of JM Harden | Representative Church Body Library | | |
| Papers of Judge John O'Hagan (1822-1890) | Irish Jesuit Archives | | |
| Papers of Kathleen Barry Moloney | UCD Archives | https://www.ucd.ie/archiv... | https://www.ucd.ie/archiv... |
| Papers of Kathleen Mulchrone | Royal Irish Academy | | |
| Papers of Lady Augusta Gregory | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Leland Bardwell | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers of Lower Hatch Street, University Hall and Lower Lesson Street | Irish Jesuit Archives | | |
| Papers of Maighréad and Siobhán de Paor | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Máire Comerford | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Mr and Mrs John Taylor Edgell | Cork City and County Archives | | |
| Papers of Muriel MacSwiney | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Patricia Coghlan | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of Professor Mary Donovan-O'Sullivan | University of Galway Archives | | |
| Papers of R.H. Moore | Offaly Archives | | |
| Papers of Revd Dr Charles William Russell (1812-1880) | Irish Jesuit Archives | | |
| Papers of Revd Robert Kane (1848 to 1929) | Irish Jesuit Archives | | |
| Papers of Robert J. Stopford | National Library of Ireland | | |
| Papers of Seamus Fitzgerald | Cork City and County Archives | | |
| Papers of St Joseph’s Conference, Society of St Vincent de Paul, Carlow | Delany Archive | https://www.delanyarchive... | |
| Papers of T.M. Healy | UCD Archives | https://www.ucd.ie/archiv... | |
| Papers of the Cuffe Family | Fingal County Archive | | |
| Papers of the Flanegan family of Woburn Lodge, Galway, and Essex, United Ki | University of Galway Archives | | |
| Papers of the Hathaway Club | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers of the Lucas family, County Offaly | University of Galway Archives | | |
| Papers of the Murphy Family | UCD Archives | https://www.ucd.ie/archiv... | https://www.ucd.ie/archiv... |
| Papers of the Tullabeg Community Rahan, Tullamore, County Offaly | Irish Jesuit Archives | | |
| Papers of the Widows' Almshouse | National Library of Ireland | | |
| Papers of Very Revd. P Canon Phelan, PP | National Library of Ireland | | |
| Papers relating to Agnes and John Smart Liddell | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers relating to Jean Montgomery | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Papers Relating to Siobhán McKenna | University of Galway Archives | | |
| Papers relating to the history of the Irish theatre | National Library of Ireland | | |
| Parker-Hutchinson Papers | National Library of Ireland | | |
| Parsonstown Union Outgoing Letter-Book | Offaly Archives | | |
| Pat Hudson Photographic Collection | North Down Museum | | |
| Patricia Lynch and R.M. Fox | National Library of Ireland | | |
| Patrick Agnew Papers | Public Record Office of Northern Ireland | | |
| Patrick Doyle Papers | Public Record Office of Northern Ireland | | |
| Patrick Galvin Papers | UCC Special Collections & Archives | | |
| Patrick McGilligan Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Paul Henry | Trinity College Dublin, Manuscripts and Archives Department | | |
| Pauline Henley Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Pawnbroking Association Papers | Public Record Office of Northern Ireland | | |
| Pearse Family | Trinity College Dublin, Manuscripts and Archives Department | | |
| Pearse Papers | National Library of Ireland | | |
| Pembroke Estate Papers | National Archives of Ireland | | |
| Pembroke Township/Urban District Council Records | Dublin City Library and Archive | | |
| Penrose Account Book | Waterford City Archives | | |
| Penrose FitzGerald Papers | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Perceval Papers | Public Record Office of Northern Ireland | | |
| Perceval-Maxwell Papers | Public Record Office of Northern Ireland | | |
| Personal letters, memoirs, etc. | Newtown School, Waterford | | |
| Peter Burrows Papers | Royal Irish Academy | | |
| Peter Paul Galligan Papers | UCD Archives | | |
| Petty Sessions Records | Laois Local Studies
National Archives of Ireland | | |
| Petworth House Archives | Clare County Archives | | |
| Phillips Papers | National Library of Ireland
Royal Irish Academy | | |
| Photograph Album of E. Homan Mulock, Ballycumber House | Offaly Archives | | |
| Photographic Collection Card Catalogue | Religious Society of Friends in Ireland Historical Library | | |
| Photographic Collections | Religious Society of Friends in Ireland Historical Library
Ulster Folk and Transport Museum
Ulster University Special Collections, Magee Campus
Waterford City Archives | | |
| Photographic Collections | Religious Society of Friends in Ireland Historical Library
Ulster Folk and Transport Museum
Ulster University Special Collections, Magee Campus
Waterford City Archives | | |
| Photographs | County Museum, Dundalk
Newtown School, Waterford | | |
| Piaras Beaslaí Papers | National Library of Ireland | | |
| Picture postcards of popular actors | Irish Theatre Archive | | |
| Pierse McCan Papers | National Library of Ireland | | |
| Pim Manuscripts | Cork City and County Archives | | |
| Pinkerton (Coleraine) Papers | Public Record Office of Northern Ireland | | |
| Pinkerton Papers | Public Record Office of Northern Ireland | | |
| Pioneer Total Abstinence Association (PTAA) | UCD Archives | https://www.ucd.ie/archiv... | https://www.ucd.ie/archiv... |
| Plan of the Infirmary, Tullamore Workhouse | Offaly Archives | | |
| Plunket Papers | Public Record Office of Northern Ireland | | |
| Plunkett Papers | National Library of Ireland | | |
| Poembook of Rebecca Wilson, of Waterford. | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Police and Crime Records | National Archives of Ireland | | |
| Political Resurgence | Kilmainham Gaol Museum | | |
| Pomeroy Papers | Public Record Office of Northern Ireland | | |
| Poole Photographic Collection | National Photographic Archive | https://www.nli.ie/en/udl... | |
| Poor Clares | Franciscan Library, Killiney
National Library of Ireland | | |
| Poor Law Records | | |
| Portadown Borough Council Records | Public Record Office of Northern Ireland | | |
| Portland Papers | Public Record Office of Northern Ireland | | |
| Portrush Urban District Council Records | Public Record Office of Northern Ireland | | |
| Portstewart Urban District Council Records | Public Record Office of Northern Ireland | | |
| Portumna Rural District Council | Galway County Council Archives | | |
| Post Office Clerical Association | Irish Labour History Museum | | |
| Postal and Telecommunications Workers Union, formerly Post Office Workers | Irish Labour History Museum | | |
| Power Correspondence | Cork City and County Archives | | |
| Powerscourt Papers | National Library of Ireland | | |
| Presbyterian Church Records | Public Record Office of Northern Ireland | | |
| Presentation Convent, Dublin | Presentation Sisters Congregational Archives | | |
| Presentation Convent, Kilkenny | Presentation Sisters Congregational Archives | | |
| Presentation Sisters South West Province - South Presentation Community | Presentation Sisters Congregational Archives | | |
| Presentation Sisters South West Province - St Joseph's Convent, Doneraile | Presentation Sisters Congregational Archives | | |
| President's Office Collection | UCC College Archives | | |
| Press cuttings, Abbey Theatre | Irish Theatre Archive | | |
| Press cuttings, Gaiety Theatre | Irish Theatre Archive | | |
| Press cuttings, Queen's Theatre, Dublin | Irish Theatre Archive | | |
| Press II Boxes 3 and 4 | Loreto Archives | | |
| Press II Boxes IV and V | Loreto Archives | | |
| Primate J.G. Beresford Papers | Armagh Robinson Library | | |
| Primate McGettigan Archive | Armagh Diocesan Archive (RC) | | |
| Printed Proclamations | National Archives of Ireland | | |
| Printed Rentals for Landed Estates Court, County Galway | University of Galway Archives | | |
| Prior-Wandesforde Papers | National Library of Ireland | | |
| Prison Gate Mission | Representative Church Body Library | | |
| Prisoners' Petitions and Cases, 1778-1836 | National Archives of Ireland | | |
| Private Collections | Military Archives | | |
| Privy Council Records | National Archives of Ireland | | |
| Probate Copy of Will of Thomas, Earl of Clanricarde | University of Galway Archives | | |
| Prof. Meehan Papers | University of Galway Archives | | |
| Professor Kevin Boyle papers | University of Galway Archives | | |
| Professor Nicholas Canny Papers | University of Galway Archives | | |
| Protestant Orphan Refuge Society | National Archives of Ireland | | |
| Protestant Orphan Society | National Archives of Ireland | | |
| Protestant Orphan Society for the County of Sligo | Representative Church Body Library | | |
| Protestant Orphan Society Papers | Public Record Office of Northern Ireland | | |
| Provincials' Correspondence, 1905 to 1959 | Irish Jesuit Archives | | |
| Purcell Papers | Royal Irish Academy | | |
| Qua Iboe Mission Papers | Public Record Office of Northern Ireland | | |
| Quaker Papers | Newtown School, Waterford | | |
| QUB Miscellaneous Manuscripts | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | https://www.qub.ac.uk/dir... |
| Queen's and Theatre Royal | Irish Theatre Archive | | |
| Queen's College, Cork, Correspondence | UCC College Archives | | |
| Quit Rent Office | National Archives of Ireland | | |
| R.G. Reid Papers | Public Record Office of Northern Ireland | | |
| R.H. Whelan Papers | Public Record Office of Northern Ireland | | |
| R.I. Best Papers | National Library of Ireland | | |
| Ralph Macklin Schools | Representative Church Body Library | | |
| Ranfurly Estate Papers | Public Record Office of Northern Ireland | | |
| Rapheal Papers | Public Record Office of Northern Ireland | | |
| Raphoe Archive | Armagh Diocesan Archive (RC) | | |
| Rate Book Ballycommon Electoral Division | Offaly Archives | | |
| Rate Return Form | Offaly Archives | | |
| Rathdown Poor Law Union and Rural District Council | National Archives of Ireland | | |
| Rathdown Rural District Council | Fingal County Archive
Wicklow Library and Archives | | |
| Rathdrum Poor Law Union | Wicklow Library and Archives | | |
| Rathdrum Rural District Council | Wicklow Library and Archives | | |
| Rathfriland Dispensary Records | Public Record Office of Northern Ireland | | |
| Rathkeale Poor Law Union | Limerick Archives | | |
| Ration Book | University of Galway Archives | | |
| Rebellion Papers | National Archives of Ireland | | |
| Record Commission | National Archives of Ireland | | |
| Record of the Estate Office | Waterford City Archives | | |
| Records of Balbriggan Town Commissioners | Fingal County Archive | | |
| Records of Balbriggan Town Commissioners. | Fingal County Archive | | |
| Records of Birr Business & Professional Women’s Association | Offaly Archives | | |
| Records of Birr Rural District Council | Offaly Archives | | |
| Records of Birr Urban District Council | Offaly Archives | | |
| Records of Daingean Town Hall Committee | Offaly Archives | | |
| Records of Dean's Grange Joint Burial Board | Dún Laoghaire-Rathdown County Council | | |
| Records of Edenderry Rural District Council | Offaly Archives | | |
| Records of Edenderry Town Commission | Offaly Archives | | |
| Records of Edenderry Union | Offaly Archives | | |
| Records of Eglish National School | Offaly Archives | | |
| Records of Geashill National School | Offaly Archives | | |
| Records of Kilbeggan Rural District Council | Offaly Archives | | |
| Records of Killyon National School | Offaly Archives | | |
| Records of King's County Grand Jury | Offaly Archives | | |
| Records of King's County Infirmary | Offaly Archives | | |
| Records of McGinn's Bakery, Tullamore | Offaly Archives | | |
| Records of Miss Harriet Celina ('Ena') Brooks, 1923-2013 | Dublin City Library and Archive | | |
| Records of North Offaly Co-operative Agricultural Society | Offaly Archives | | |
| Records of Offaly Board of Health and Public Assistance | Offaly Archives | | |
| Records of Offaly County Council | Offaly Archives | | |
| Records of Parsonstown Model School | Offaly Archives | | |
| Records of Parsonstown Town Commissioners | Offaly Archives | | |
| Records of Parsonstown Union | Offaly Archives | | |
| Records of Robert Perry & Co. (Belmont Mills) | Offaly Archives | | |
| Records of Rogers & Co. Solicitors | Offaly Archives | | |
| Records of Roscrea Rural District No. 2 | Offaly Archives | | |
| Records of Sir Patrick Dun's Hospital | National Archives of Ireland | | |
| Records of the Central Association of Irish Schoolmistresses | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| Records of the City Law Adviser | Waterford City Archives | | |
| Records of the Coombe Hospital | National Archives of Ireland | | |
| Records of the Corporation of Weavers | Royal Society of Antiquaries of Ireland | | |
| Records of the Fanning Institute | Waterford City Archives | | |
| Records of the Finance Department | Waterford City Archives | | |
| Records of the Honorable Society of King's Inns | King's Inns Library | | |
| Records of the Labourer's Dwelling Committee | Waterford City Archives | | |
| Records of the Library Committee | Waterford City Archives | | |
| Records of the Mageough Home, Dublin | Representative Church Body Library | | |
| Records of the Mater Misercordiae Hospital | National Archives of Ireland | | |
| Records of the Muncipal Museum Committee | Waterford City Archives | | |
| Records of the Public Health Committee | Waterford City Archives | | |
| Records of the Rotunda Hospital | National Archives of Ireland | | |
| Records of the Society for Promoting the Education of the Poor of Ireland | Church of Ireland Centre | | |
| Records of the Town Clerk | Waterford City Archives | | |
| Records of the Tuberculosis Committee | Waterford City Archives | | |
| Records of Tullamore Rural District Council | Offaly Archives | | |
| Records of Tullamore Union | Offaly Archives | | |
| Records of Tullamore Urban District Council | Offaly Archives | | |
| Records Relating to the Holy Ghost Hospital | Waterford City Archives | | |
| Redhall Papers | Public Record Office of Northern Ireland | | |
| Redmond Papers | National Library of Ireland | | |
| Redmond Photographic Collection | Laois Local Studies | https://laoislocalstudies... | |
| Reformed Presbyterian Church Records | Public Record Office of Northern Ireland | | |
| Reggie Smith Papers | Ulster University Archive & Special Collections, Coleraine Campus | | |
| Register of Judgements of the Fair Rents Tribunal | Limerick Archives | | |
| Registers of Electors | Cork City and County Archives | | |
| Registers of Vows | Loreto Archives | | |
| Registrar's Office Collection | UCC College Archives | | |
| Registry of Friendly Societies | National Archives of Ireland | | |
| Reidy Deposit | Cork City and County Archives | | |
| Reidy Papers | Kerry Local Studies and Archives Department | | |
| Releases of 1916 prisoners | Military Archives | | |
| Releases of 1916 prisoners under amnesty | Military Archives | | |
| Relief Commission Records | National Archives of Ireland | | |
| Religious Sisters of Charity | Religious Sisters of Charity Archives | | |
| Religious Society of Friends Papers | Public Record Office of Northern Ireland | | |
| Rental Ledgers of the Cox Estate, Clara | Offaly Archives | | |
| Rental of Banagher Estate | Offaly Archives | | |
| Rental of the Estate of the Earl of Charleville | Offaly Archives | | |
| Rental of the lands of William and Thomas H. Burke | University of Galway Archives | | |
| Report of the Engineering Inspector on housing | Offaly Archives | | |
| Rev. Dr F.T.O. Dwyer Papers | Limerick Diocesan Archives (RC) | | |
| Revd. Denis Collins | Cloyne Diocesan Archive (RC) | | |
| Revd. Fletcher de Cobain Papers | National Library of Ireland | | |
| Revd. J.B. Armour Papers | Public Record Office of Northern Ireland | | |
| Revd. William Maziere Brady Papers | National Library of Ireland | | |
| Revolutionary Women Photographs | Laois Local Studies | | |
| Reynell, Henrietta E. | Royal Irish Academy | | |
| Rice of Mountrice, Co. Kildare and Wrightson Papers | UCD Archives | | |
| Richard Butcher Case Books | RCSI Heritage Collections | | |
| Richard Doherty Collection | University of Galway Archives | | |
| Richard Mulcahy Papers | UCD Archives | | |
| Richardson of Drum Papers | Public Record Office of Northern Ireland | | |
| Richardson Papers | Public Record Office of Northern Ireland | | |
| Riddell Hall Papers | Public Record Office of Northern Ireland | | |
| Rita Dorr Papers | Kilmainham Gaol Museum | | |
| Robb Papers | Public Record Office of Northern Ireland | | |
| Robert Dudley-Edwards Papers | UCD Archives | | |
| Robert White Papers | National Library of Ireland | | |
| Roberts papers | National Library of Ireland | | |
| Robertson Papers | National Library of Ireland | | |
| Robin Hall Papers | Public Record Office of Northern Ireland | | |
| Roche Family Manuscripts | Cork City and County Archives | https://corkarchives.ie/e... | |
| Roche Papers | National Library of Ireland | | |
| Roche, Fitzgerald and Sarsfield Papers | Royal Irish Academy | | |
| Rockingham Papers | National Library of Ireland | | |
| Roden Papers | Public Record Office of Northern Ireland | | |
| Röntgen Ray Case | University of Galway Archives | | |
| Rosamund Jacob Papers | National Library of Ireland | | |
| Roscommon Board of Health | Roscommon Local Studies and Archives | | |
| Roscommon County Council | Roscommon Local Studies and Archives | | |
| Roscommon Poor Law Union | Roscommon Local Studies and Archives | | |
| Roscommon Town Commissioners | Roscommon Local Studies and Archives | | |
| Roscrea Poor Law Union | Tipperary Studies | | |
| Roscrea Rural District Council | Laois Local Studies | | |
| Rose-Clelland Papers | Public Record Office of Northern Ireland | | |
| Rosenfield Collection | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Ross of Bladensburg Papers | Public Record Office of Northern Ireland | | |
| Rosse Manuscripts | National Library of Ireland | | |
| Rossmore Papers | Public Record Office of Northern Ireland | | |
| Rotunda Hospital, Dublin | National Library of Ireland | | |
| Rowan (Fenagh) Poor Law Union | Leitrim Local Studies Department | | |
| Rowan Papers | National Library of Ireland | | |
| Rowan-Hamilton (Killyleagh) Papers | Public Record Office of Northern Ireland | | |
| Royal City of Dublin Hospital, Baggott Street | RCSI Heritage Collections | | |
| Royal College of Science for Ireland | UCD Archives | | |
| Royal College of Surgeons in Ireland | RCSI Heritage Collections | | |
| Royal College of Surgeons in Ireland Library Catalogue | RCSI Heritage Collections | | |
| Royal Dublin Society | National Library of Ireland | | |
| Royal Hospital Kilmainham | National Archives of Ireland | | |
| Royal Institute of Architects of Ireland | Irish Architectural Archive | | |
| Royal University of Ireland | National University of Ireland | | |
| Rules, Constitutions. Exhortations | Loreto Archives | | |
| Rural Electrification | Electricity Supply Board (ESB) Archives | | |
| Russell Papers | Maynooth University and St Patrick's College, Maynooth | | |
| Ruth Sherry Index Cards | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Ryan of Inch Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Rynne Family Papers | University of Galway Archives | | |
| Sackville Papers | Public Record Office of Northern Ireland | | |
| Saint Mary's and Saint Patrick's Parish Church Records | Public Record Office of Northern Ireland | | |
| Saint Ultan's Hospital | Royal College of Physicians of Ireland | | |
| Samuel Stevenson and Son Papers | Public Record Office of Northern Ireland | | |
| Sarah Cecilia Harrison and Sir Hugh Lane Collection | National Gallery of Ireland Library | https://sourcenationalgal... | |
| Sarah Curran papers | National Library of Ireland | | |
| Sarah Purser correspondence | National Library of Ireland | | |
| Sarah Purser Papers | National Library of Ireland | | |
| Sarsfield Papers | National Library of Ireland | | |
| Sarsfield Papers (Ronayne) | National Library of Ireland | | |
| Sarsfield Vesey Papers | National Archives of Ireland | | |
| Savage Armstrong Papers | Public Record Office of Northern Ireland | | |
| Scariff Rural District Council | Clare County Archives | | |
| Scarman Tribunal (1969) | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Scéalta Ó gCarna | University of Galway Archives | | |
| School for Educating the Daughters of the Irish Clergy | Representative Church Body Library | | |
| School Records | Public Record Office of Northern Ireland | | |
| School Registers | Leitrim Local Studies Department | | |
| Scoil Íte | UCD Archives | | |
| Scully Papers | National Library of Ireland | | |
| Séamus de Búrca | Irish Theatre Archive | | |
| Seamus O'Sullivan, Estella Solomons correspondence with Kathleen Goodfellow | https://manuscripts.catal... | |
| Sean Ó Luing Papers | National Library of Ireland | | |
| Seán Ó Riada Collection/ Bailiúchán Sheáin Uí Riada | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Seán Ó Riordáin Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Sean O'Mahony Papers | National Library of Ireland | | |
| Sean T. Ó Ceallaigh Papers | National Library of Ireland | | |
| Secretary to the President's Office | National Archives of Ireland | | |
| Secretary's Office | UCC College Archives | | |
| Selection of Private Accessions, 1980-2002 | National Archives of Ireland | | |
| Sexton Photographic Collection | Mayo Local History Department | https://www.mayo.ie/libra... | |
| Shackleton Family Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Shackleton Papers | Kildare Local Studies, Genealogy and Archives Department | | |
| Shane Leslie Papers | National Library of Ireland | | |
| Shannon Papers | National Library of Ireland
Public Record Office of Northern Ireland | | |
| Shapland Carew Papers | National Archives of Ireland | | |
| Sharman Crawford Papers | Public Record Office of Northern Ireland | | |
| Shaw Papers | Public Record Office of Northern Ireland | | |
| Shearman Papers | Maynooth University and St Patrick's College, Maynooth | | |
| Sheehy-Skeffington Papers | National Library of Ireland | | |
| Sheffield Papers | Public Record Office of Northern Ireland | | |
| Sheil and Lalor Families | UCD Archives | | |
| Shelagh Richards | Irish Theatre Archive | | |
| Sheppard Papers | National Library of Ireland | | |
| Shields Family Archive | University of Galway Archives | | |
| Shillelagh Poor Law Union | Wicklow Library and Archives | | |
| Shillelagh Rural District Council | Wicklow Library and Archives | | |
| Shirley Papers | Public Record Office of Northern Ireland | | |
| Sick and Indigent Roomkeepers Society | National Archives of Ireland | | |
| Sighle Humphreys Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| Sinclair Papers | Public Record Office of Northern Ireland | | |
| Sinn Féin | Kilmainham Gaol Museum | | |
| Siobhan Lankford Papers | Cork City and County Archives | | |
| Siobhán McKenna Papers | University of Galway Archives | | |
| Sir Charles Blackmore Papers | Public Record Office of Northern Ireland | | |
| Sir Dominic Corrigan | Royal College of Physicians of Ireland | | |
| Sir Patrick Dun's Hospital | Royal College of Physicians of Ireland | | |
| Sir Robert Lynd Papers | Public Record Office of Northern Ireland | | |
| Sir William Teeling Papers | National Library of Ireland | | |
| Skiddy's Almshouse | Cork City and County Archives | | |
| Slide Collection of Hunt Family | Hunt Museum | | |
| Slieveardagh Rural District Council | Tipperary Studies | | |
| Slievemargy Rural District Council | Carlow County Archive
Laois Local Studies | | |
| Sligo Board of Health Minute Books | Sligo Archives Service | | |
| Sligo County Council | Sligo Archives Service | | |
| Sligo County Infirmary | Sligo Archives Service | | |
| Sligo Dispensary | Sligo Archives Service | | |
| Sligo Gaol | Sligo Archives Service | | |
| Sligo Poor Law Union | Sligo Archives Service | | |
| Sligo Workhouse Registers | Sligo Archives Service | | |
| Small Collections | Fingal County Archive
UCD Archives | | |
| Small Collections | Fingal County Archive
UCD Archives | | |
| Small Private Accessions | National Archives of Ireland | | |
| Small Private Collections | Longford Archives and Local Studies | https://www.longfordlibra... | |
| Smiles Papers | Public Record Office of Northern Ireland | | |
| Smith Collection | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Smyth of Barbavilla Papers | National Library of Ireland | | |
| Smyth Papers | National Library of Ireland | | |
| Smythe of Barbavilla Papers | National Library of Ireland | | |
| Smythe Papers | Westmeath County Archives Department | | |
| Social and Democratic Party Papers | Public Record Office of Northern Ireland | | |
| Society of Friends | Royal Irish Academy | | |
| Society of Friends Central Relief Committee | National Archives of Ireland | | |
| Society of St Anne and Dublin Operative Bakers Friendly Society | Irish Labour History Museum | | |
| Solicitors and Landed Estate Papers | Cork City and County Archives | https://corkarchives.ie/e... | |
| Solomons Case Books | RCSI Heritage Collections | | |
| Some Papers of the Restored Society | Irish Jesuit Archives | | |
| Somerville and Ross Collection | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| Somerville and Ross Papers (TCD) | Trinity College Dublin, Manuscripts and Archives Department | | |
| Sophie O'Brien Papers | Cork City and County Archives | http://catalogue.corkarch... | |
| Sound Archive | RTÉ Archive (Sound) | | |
| Sound Collection | Irish Traditional Music Archive/ Taisce Ceoil Dúchais Éireann | | |
| South Africa Business Correspondence | Loreto Archives | | |
| South City Markets Fire Relief Fund | Dublin City Library and Archive | https://www.dublincity.ie... | |
| South Dublin Poor Law Union | Fingal County Archive | | |
| South Dublin Poor Law Union and Rural District Council | National Archives of Ireland | | |
| South Dublin Rural District Council | Fingal County Archive | | |
| Spanish Civil War - Accounts of Nuns' Experiences | Loreto Archives | | |
| Special Collections | Ulster University Special Collections, Magee Campus | | |
| Spence, Bryson and Company Papers | Public Record Office of Northern Ireland | | |
| Spencer Bernard Papers | Public Record Office of Northern Ireland | | |
| Spencer Freeman Collection | Irish Film Archive | | |
| Spender Papers | Public Record Office of Northern Ireland | | |
| Springvale Bleachworks Papers | Public Record Office of Northern Ireland | | |
| St Canice's District Lunatic Asylum | St Canice's Hospital, Kilkenny | | |
| St Dympna's Psychiatric Hospital, Carlow | St Dympna's Hospital, Carlow | https://www.delanyarchive... | |
| St Fin Barre's Cathedral Cork Archive | Representative Church Body Library | | |
| St Finbarr's Hospital (South Cork County Home and Hospital) | Cork City and County Archives | http://catalogue.corkarch... | |
| St John's (Fever and Lock) Hospital | Limerick Archives | | |
| St Monica's Home for the Blind, Infirmary Road, Cork | Cork City and County Archives | | |
| St Raphael's Hospital Youghal | Cork City and County Archives | http://catalogue.corkarch... | |
| St Vincent de Paul | Society of St Vincent de Paul | | |
| Stacpoole Kenny Papers | National Library of Ireland | | |
| State Files, Cork Circuit Criminal Court | National Archives of Ireland | | |
| State Files, Dublin Circuit Criminal Court | National Archives of Ireland | | |
| State of the Country Papers | National Archives of Ireland | | |
| State Papers | National Archives of Ireland | | |
| Stationery Office Publications | Public Record Office of Northern Ireland | | |
| Stephen Family Papers | Representative Church Body Library | | |
| Stephen Gwynn Papers | National Library of Ireland | | |
| Stephen Rynne-Alice Curtayne Papers | National Library of Ireland | | |
| Stereo Collection | National Photographic Archive | | |
| Stewart of Ards Papers | Public Record Office of Northern Ireland | | |
| Stewart of Fortstewart Papers | Public Record Office of Northern Ireland | | |
| Stewart of Killymoon Papers | Public Record Office of Northern Ireland | | |
| Stewart of Portstewart Papers | Public Record Office of Northern Ireland | | |
| Stewart Papers | Public Record Office of Northern Ireland | | |
| Stopford Family Papers | Representative Church Body Library | | |
| Strabane Board of Guardian Records | Public Record Office of Northern Ireland | | |
| Strabane Poor Law Union | Donegal County Archives | | |
| Strabane Rural District Council | Donegal County Archives | | |
| Strabane Rural District Council Records | Public Record Office of Northern Ireland | | |
| Strabane Young Men's Christian Association Papers | Public Record Office of Northern Ireland | | |
| Straford Papers | National Library of Ireland | | |
| Strain Papers | Public Record Office of Northern Ireland | | |
| Stranorlar Poor Law Union | Donegal County Archives | | |
| Stranorlar Rural District Council | Donegal County Archives | | |
| Stratford Papers | | |
| Strickland of County Roscommon | University of Galway Archives | | |
| Strokestown Poor Law Union | Roscommon Local Studies and Archives | | |
| Strokestown Rural District Council | Roscommon Local Studies and Archives | | |
| Strutt Papers | Public Record Office of Northern Ireland | | |
| Studdert Papers | National Library of Ireland | | |
| Sunbeam Collection | Cork City and County Archives | | |
| Sunday School Society for Ireland | Representative Church Body Library | | |
| Supreme Court and Court of Criminal Appeal | National Archives of Ireland | | |
| Sweetman Correspondence | National Archives of Ireland | | |
| Swinford Poor Law Union | National Library of Ireland | | |
| Sybil Connolly Collection | Hunt Museum | https://www.huntmuseum.co... | |
| Synge | Trinity College Dublin, Manuscripts and Archives Department | | |
| Synge Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| T. P. O'Nuallaín Papers | National Library of Ireland | | |
| T.C. Murray Papers | National Library of Ireland | | |
| T.F. O'Sullivan Papers | | |
| T.P. Gill Papers | National Library of Ireland | | |
| T.W.T. Dillon Papers | UCD Archives | | |
| Tadgh Ó Donnchadha Papers | UCC Special Collections & Archives | | |
| Taibhdhearc na Gaillimhe | University of Galway Archives | | |
| Tandragee Estate Papers | Public Record Office of Northern Ireland | | |
| Tandragee Urban District Council Records | Public Record Office of Northern Ireland | | |
| Teachers' Union of Ireland | UCD Archives | | |
| Teangadoir | University of Galway Archives | | |
| Teeling Papers | National Library of Ireland | | |
| Television Programme Archive | RTÉ Archive (Television) | | |
| Templehouse Papers | Public Record Office of Northern Ireland | | |
| Tenants in the Barony of Clankee, 1880s | Cavan County Archives | https://www.cavanlibrary.... | |
| Tennent Papers | Public Record Office of Northern Ireland | | |
| Terence MacSwiney Papers | UCD Archives | | |
| Terence McSwiney Papes | UCD Archives | | |
| Terez Nelson Dance Company | Irish Theatre Archive | | |
| Tew Family Documents | Royal Irish Academy | | |
| The Allott Collection | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Armstrong Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Armstrong Photographs | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Ballyphehane Oral History Project | Cork Folklore Project | https://corkfolklore.org/... | |
| The Barry Collection | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Belmont Mills Archive | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| The Burrowes Archive | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| The Citizen Army | Military Archives | | |
| The Coghill Family Collection | Queen's University Belfast Special Collections and Archives | https://grants.fnl.org.uk... | |
| The Cork Memory Map Collection | Cork Folklore Project | https://corkfolklore.org/... | |
| The Crossle Papers | Newry City Library
Public Record Office of Northern Ireland | | |
| The Cuala Press Business Archives | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| The Cuala Press Card Collection | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| The Cuala Press Print Collection | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| The Daly Chronicle | University of Galway Archives | | |
| The Daly Papers | University of Limerick Special Collections and Archives | https://specialcollection... | https://specialcollection... |
| The De Laval/ Willis Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Duchess of Marlborough Relief Fund | Dublin City Library and Archive | https://www.dublincity.ie... | |
| The Eoin O'Brien AJ Leventhal/Ethna MacCarthy Collection | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| The Fownes/ Tighe Manuscripts | Queen's University Belfast Special Collections and Archives | https://www.qub.ac.uk/dir... | |
| The Frances Condell Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Glin Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Graham Archive | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| The Hibernian Bible Society | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| The Irish Ramblers Club | Dublin City Library and Archive | | |
| The Jim Kemmy Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Kate O'Brien Collection | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Marquess of Sligo Archive | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| The McGowan Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Molyneux Archive | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| The Niamh Bhreathnach Archive | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| The O'Carrol Collection | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The O'Mara Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The O'Rahilly Papers | UCD Archives | | |
| The Papers of Daniel Corkery | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| The Papers of the Kirwans of Castlehackett, county Galway | University of Galway Archives | | |
| The Penrose Family Collection | Waterford City Archives | | |
| The Primrose League | Cork City and County Archives | | |
| The Rosse Papers | Birr Castle Archives | https://www.offalyarchive... | |
| The Sullivan Barry Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| The Teresa Deevy Archive | Maynooth University and St Patrick's College, Maynooth | http://deevy.nuim.ie | |
| The Timothy Looney Papers | University of Limerick Special Collections and Archives | https://specialcollection... | |
| The Trinity Women Graduates Archive | Trinity College Dublin, Manuscripts and Archives Department | https://manuscripts.catal... | |
| The Vickery Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| The Wardell Archive | Maynooth University and St Patrick's College, Maynooth | https://nuim.libguides.co... | |
| Theatre collection | Belfast Central Library | | |
| Theatres to 1914 | Belfast Central Library | | |
| Tholsell Court Records | Dublin City Library and Archive | | |
| Thomas Hewitt Papers | Cork City and County Archives | | |
| Thomas Johnson Papers | National Library of Ireland | | |
| Thomas M Kettle Papers | UCD Archives | | |
| Thomas Mac Greevy Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Thomas MacGreevy Papers | | |
| Thomas Mc Donagh Papers | National Library of Ireland | | |
| Thomas McPartlin Papers | UCD Archives | | |
| Thomas O'Donnell Papers | National Library of Ireland | | |
| Thomas Wildridge's Charity | Representative Church Body Library | | |
| Thomastown Poor Law Union | Kilkenny Local Studies Department | | |
| Thomastown Rural District Council | Kilkenny Local Studies Department | | |
| Thomson of Jennymount Papers | Public Record Office of Northern Ireland | | |
| Thrift Abstracts | National Archives of Ireland | | |
| Thurles Local Authority Records | Tipperary Studies | | |
| Thurles Poor Law Union | Tipperary Studies | | |
| Thurles Rural District Council | Tipperary Studies | | |
| Tim Robinson | University of Galway Archives | | |
| Timothy Murphy Papers | Cloyne Diocesan Archive (RC) | | |
| Tipperary County Infirmary | Representative Church Body Library | | |
| Tipperary Grand Jury Records | Tipperary Studies | | |
| Tipperary Irish Tourist Association Reports | Tipperary Studies | https://www.tippstudiesdi... | |
| Tipperary Landed Estates Records | Tipperary Studies | https://www.tippstudiesdi... | |
| Tipperary Local Authority Records | Tipperary Studies | | |
| Tipperary National School Registers and Roll Books | Tipperary Studies | https://www.tippstudiesdi... | |
| Tipperary Number 2 Rural District Council | Tipperary Studies | | |
| Tipperary Poor Law Union | Tipperary Studies | | |
| Tipping Papers | Public Record Office of Northern Ireland | | |
| Tithe Applotment Books | | |
| Tivy Papers | Cork City and County Archives | | |
| Todd Andrews Papers | UCD Archives | | |
| Tommy Gribben Photographic Collection | North Down Museum | | |
| Torney Papers | Public Record Office of Northern Ireland | | |
| Tottenham Family Papers | Royal Irish Academy | | |
| Town Clerk Records | Waterford City Archives | | |
| Townley Hall Papers | National Library of Ireland | | |
| Townley Taibhdhearc Collection | University of Galway Archives | | |
| Townshend Papers | National Archives of Ireland | | |
| Trade Union Records | Public Record Office of Northern Ireland | | |
| Tralee Poor Law Union | Kerry Local Studies and Archives Department | | |
| Tralee Rural District Council | Kerry Local Studies and Archives Department | | |
| Transferred Officers Protection Association | Irish Labour History Museum | | |
| Transportation Database, 1778-1868 | National Archives of Ireland | | |
| Transportation Registers, 1836-1857 | National Archives of Ireland | | |
| Trant Papers | National Library of Ireland | | |
| Treasurer's Account Book | Offaly Archives | | |
| Trench Paprs | National Library of Ireland | | |
| Trillick Rural District Council Records | Public Record Office of Northern Ireland | | |
| Trim Poor Law Union | Meath Local Studies and Family History Department | | |
| Trotter Papers | Public Record Office of Northern Ireland | | |
| Tuam Poor Law Union | Galway County Council Archives | | |
| Tuam Rural District Council | Galway County Council Archives | | |
| Tubbercurry Poor Law Union | Sligo Archives Service | | |
| Tulla Rural District Council | Clare County Archives | | |
| Twiss Collection | Royal Irish Academy | | |
| Tyrone County Council Records | Public Record Office of Northern Ireland | | |
| Ulster Headmistresses' Association Papers | Public Record Office of Northern Ireland | | |
| Ulster Liberal Party Papers | Public Record Office of Northern Ireland | | |
| Ulster Quarterly Meetings | Religious Society of Friends in Ireland Historical Library | | |
| Ulster Unionism | Kilmainham Gaol Museum | | |
| Ulster Unionist Council Papers | Public Record Office of Northern Ireland | | |
| Ulster Volunteer Force Papers | Public Record Office of Northern Ireland | | |
| Ulster Women Artists Society | National Irish Visual Arts Library (NIVAL) | | |
| Ulster Women's Unionist Council Papers | Public Record Office of Northern Ireland | | |
| Union of Professional and Technical Civil Servants | National Archives of Ireland | | |
| Union Theological College Pamphlet Collection | Union Theological College | | |
| University College Dublin, Manuscripts | UCD Special Collections | | |
| Upton Papers | UCD Archives | | |
| Urlingford Local Authority Records | Kilkenny Local Studies Department | | |
| Urlingford Poor Law Union | Kilkenny Local Studies Department | | |
| Urlingford Rural District Council | Kilkenny Local Studies Department | | |
| Ursuline Convent Cork | Sisters of the Irish Ursuline Union | | |
| Ursuline Convent Sligo | Sisters of the Irish Ursuline Union | | |
| Ursuline Convent Thurles | Sisters of the Irish Ursuline Union | | |
| Ursuline Convent Waterford | Sisters of the Irish Ursuline Union | | |
| Ussher Family Papers | Representative Church Body Library | | |
| Ussher Papers | National Library of Ireland | | |
| Valuation List, Holy Trinity Parish, Cork City | Cork City and County Archives | https://publications.cork... | |
| Verdon Papers | National Library of Ireland | | |
| Verner/Wingfield Papers | Public Record Office of Northern Ireland | | |
| Vigors Papers | Carlow County Archive
National Library of Ireland | | |
| Villiers-Stuart Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Villiers-Stuart Papers | National Library of Ireland | | |
| Vivien Simpson Papers | Public Record Office of Northern Ireland | | |
| Vocal Catalogue (All Voice Types with Piano Accompaniment) | Contemporary Music Centre | https://www.cmc.ie/catalo... | |
| Voices of the Troubles | Cavan County Archives | https://www.cavanlibrary.... | |
| W. A. Henderson Collection | National Library of Ireland | | |
| W. Fletcher de Cobain Papers | National Library of Ireland | | |
| W.G. Fallon Papers | National Library of Ireland | | |
| W.G. Fallon Papers | National Library of Ireland | | |
| W.J. Shannon & Co. solicitors | National Archives of Ireland | | |
| W.R. Rodgers Papers | Public Record Office of Northern Ireland | | |
| W.R. Scott Papers | Public Record Office of Northern Ireland | | |
| Wade Papers | National Library of Ireland
University of Galway Archives | | |
| Wages Council Records | Public Record Office of Northern Ireland | | |
| Wallace Papers | Public Record Office of Northern Ireland | | |
| Walsh Papers | Dublin Diocesan Archives (RC) | | |
| Wandesforde Papers | UCD Archives | | |
| War of Independence | Kilmainham Gaol Museum | | |
| Wardenstown Papers | Public Record Office of Northern Ireland | | |
| Waring Papers | Public Record Office of Northern Ireland | | |
| Warrenpoint Urban District Council Records | Public Record Office of Northern Ireland | | |
| Watercolour Society of Ireland | National Gallery of Ireland Library | | |
| Waterford Bakers Union | UCD Archives | | |
| Waterford Board of Health and Public Assistance | Waterford City Archives | | |
| Waterford Cathedral | Representative Church Body Library | | |
| Waterford City and County Infirmary | Waterford City Archives | | |
| Waterford Corporation Archives | Waterford City Archives | | |
| Waterford Local Authority Records | Waterford County Archives | | |
| Waterford Maternity Hospital | Medical Missionaries of Mary Archive | | |
| Waterford Monthly Meeting Documents | Religious Society of Friends, Waterford | | |
| Waterford Monthly Meeting Papers | Religious Society of Friends, Waterford | | |
| Waterford Poor Law Union | Waterford County Archives | | |
| Waterford Rural District Council | Kilkenny Local Studies Department
Waterford County Archives | | |
| Weldon Papers | National Library of Ireland | | |
| Wellington Papers | Public Record Office of Northern Ireland | | |
| Wendy Shea | Irish Theatre Archive | | |
| Westenra Papers | National Library of Ireland | | |
| Westmeath County Council | Westmeath County Archives Department | | |
| Westmoreland Correspondence | National Archives of Ireland | | |
| Westmoreland Lock Hospital | Royal College of Physicians of Ireland | | |
| Westport Poor Law Union | National Library of Ireland | | |
| Westport Protestant Orphan Society | Representative Church Body Library | | |
| Wexford County Council | Wexford County Archive | https://wexfordcountyarch... | |
| Wexford County Hospital | Wexford County Archive | | |
| Wexford Estate Papers - Individual Rentals | Wexford County Archive | https://wexfordcountyarch... | |
| Wexford Local Authority | Wexford County Archive | | |
| Wexford Poor Law Union | Wexford County Archive | | |
| Wexford Poor Law Union Records (Miscellaneous) | Wexford County Archive | | |
| Whaley Papers | National Library of Ireland | | |
| Whitehead Urban District Council Records | Public Record Office of Northern Ireland | | |
| Whitley Stokes Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Wickham Papers | Public Record Office of Northern Ireland | | |
| Wicklow County Council | Wicklow Library and Archives | | |
| Wicklow Monthly Meetings | Religious Society of Friends in Ireland Historical Library | | |
| Wicklow Papers | National Library of Ireland | | |
| Wicklow Urban District Council | Wicklow Library and Archives | | |
| Wilkie Photographic Collection | Cork City and County Archives | https://publications.cork... | https://iar.ie/archive/wi... |
| Wilkinson Papers | Public Record Office of Northern Ireland | | |
| William D Moore Commonplace Book | RCSI Heritage Collections | | |
| William Mason Monck Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| William Norton Papers | Irish Labour History Museum | | |
| William O'Brien Papers | National Library of Ireland
UCC Special Collections & Archives | | |
| William Patrick Ryan Papers | UCD Archives | https://www.ucd.ie/archiv... | |
| William Smith O'Brien Papers | National Library of Ireland | | |
| Wilmot Journals [Daschkov papers] | Royal Irish Academy | | |
| Wilson and Company Solicitors Papers | Public Record Office of Northern Ireland | | |
| Wilson-Lynch Papers | University of Galway Archives | https://archivesearch.lib... | https://landedestates.ie/... |
| Wiltshire Collection | National Photographic Archive | https://www.nli.ie/en/udl... | |
| Winslow Papers | Public Record Office of Northern Ireland | | |
| Wm Fletcher de Cobain Papers | National Library of Ireland | | |
| Wm Flethcer de Cobain Papers | National Library of Ireland | | |
| Wolfe Papers | National Library of Ireland | | |
| Women Artists Action Group | National Irish Visual Arts Library (NIVAL) | | |
| Woodfield Papers | Offaly Archives | | |
| Workers Union of Ireland | Irish Labour History Museum | | |
| Workhouse Daybook | Offaly Archives | | |
| Workhouse Provisions Book | Offaly Archives | | |
| Workman Papers | Public Record Office of Northern Ireland | | |
| Woulfe Flanagan | National Archives of Ireland | | |
| Wright Collection | UCC Special Collections & Archives | https://libguides.ucc.ie/... | |
| Wyche Documents | National Archives of Ireland | | |
| Wylly Knox and Wakeman Papers | Public Record Office of Northern Ireland | | |
| Wyly Papers | Public Record Office of Northern Ireland | | |
| Wynne Family Papers | Trinity College Dublin, Manuscripts and Archives Department | | |
| Wynne Photographic Collection | Mayo Local History Department | https://www.mayo.ie/libra... | |
| Wyse Papers | National Library of Ireland | | |
| Yearly Meetings | Religious Society of Friends in Ireland Historical Library | | |
| Yeats Collection | Gilbert Library (Dublin City Library) | | |
| Yeats Letters | Sligo Archives Service | | |
| Youghal Rural District Council | Waterford County Archives | | |
| Youghal Town Records | Cork City and County Archives | | |
| Young of Culdaff Papers | Public Record Office of Northern Ireland | | |
| Young Papers | Public Record Office of Northern Ireland | | |
| Young Women's Christian Association (YWCA) | Representative Church Body Library | | |