| 13072 | Armagh County Museum | 1960/153 | 1818-1851 | Case book, Dr William Lodge Kidd, 342 pages, 1818-18... | |
| 13144 | Armagh County Museum | 1956/61 | 1838
1851 | Memoranda books, medical, formerly belonged to Surge... | |
| 19143 | Armagh Robinson Library | Volume 1850-1859 | 1851 | An extract from the Armagh Guardian regarding t... | Dean Rennison Papers |
| 8754 | Ballymena Central Library | U/A(LAR)362.5 | 1840-1851 | Larne Board of Guardian Minutes, copied from the Pub... | Larne Board of Guardian Records |
| 8765 | Ballymoney Library | U/A-BMO-BNA929.2LES | 1851 | Bound typescript volume of the history of the Leslie... | |
| 14393 | Cavan County Archives | | 1807-1851 | Cavan Assizes, 1807-1851. 1 volume, contains the nam... | Cavan Grand Jury Records |
| 16971 | Clare County Archives | | 1851-1876 | Rough Minute Books:May 1851 - January 1852January 18... | Kilrush Poor Law Union |
| 17016 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1796.00/6/1851 Photocopy of newspaper cutting from t... | Bishop W. Keane Papers |
| 17021 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1796.00/10/1851 From 'The Nation' 'The t... | Bishop W. Keane Papers |
| 17036 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.06/5/1851 14 November 1851. Letter from Angelin... | Timothy Murphy Papers |
| 17020 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1796.04/9/1851 Letter, Bishop M Slattery to Bishop ... | Bishop W. Keane Papers |
| 17033 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.05/2/1851 Long letter from Rev. M. Sheehan, P.P... | Timothy Murphy Papers |
| 17034 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.06/2/1851 Letter from Sr M. Teresa Hogan, Charl... | Timothy Murphy Papers |
| 17035 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.04/7/1851 Letter from the Secretaries Education... | Timothy Murphy Papers |
| 17037 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1795.06/1/1852 Note and expenditure. M H Convent to ... | Timothy Murphy Papers |
| 12601 | Cork City and County Archives | U313 | 1834-1851 | (i) Miscellaneous posters, 39 items. Theatre Royal, ... | |
| 22991 | Cork City and County Archives | U140/Class E/ | 1845-1851 | Day80/39 Cork Ladies Anti-Slavery Society, Boston Ba... | Dowden Papers |
| 22989 | Cork City and County Archives | U140/Class E/ | 1851 | Day80/145 Cork Central Ragged School Association, ci... | Dowden Papers |
| 22996 | Cork City and County Archives | U140/Class E/ | 1850-1851 | Day82/11 Medical Reports 1850-1851; invitation to Mr... | Dowden Papers |
| 23220 | Cork City and County Archives | U15B/ | 1851 | P/C 34 Katherine Bullen, Sunday's Well Road to H... | Thomas Hewitt Papers |
| 23228 | Cork City and County Archives | U15B/ | 1851-1866 | P/C 219-225 Anne and Thomas Love, 67 Evergreen, Cork... | Thomas Hewitt Papers |
| 23250 | Cork City and County Archives | U140/ClassD/ | 1851 | 199: Letter from Maria Hall to Richard Dowden, 28 Ju... | Dowden Papers |
| 23224 | Cork City and County Archives | U15B/ | 1851 | P/C 94 6/6/1851 Dr Charles Hewitt (Sydney Place, Cor... | Thomas Hewitt Papers |
| 19771 | Crawford Art Gallery | | 1851-1862 | School Roll, the Cork College of Design, 1 October 1... | |
| 16487 | Delany Archive | DA P20 | 1851-1894 | Most items in the collection are minute books (1851-... | Papers of St Joseph’s Conference, Society of St Vincent de Paul, Carlow |
| 11732 | Donegal County Archives | CH/BV/7/; CH/BV/8/ | 1851-1942 | Minute Books (Digitised)Stranorlar Board of Guardian... | Stranorlar Poor Law Union |
| 21896 | Kerry Local Studies and Archives Department | | 1793
1807
1817
1851 | Deeds, County Cork estate: No 192 12 August 1851. Co... | Listowel Papers |
| 3383 | Kilkenny Local Studies Department | BG159/BC | 1851-1862 | Letters from the Poor Law Commissioner and Local Gov... | Urlingford Poor Law Union |
| 11701 | Kilkenny Local Studies Department | CR/D/10 | 1843-1851 | Kilkenny Corporation, Minute Book, 25 November 1843 ... | Kilkenny Corporation |
| 5725 | Laois Local Studies | | 1851-1886 | Minute Books, 1851-1886:1851-18521857-18581859-18601... | Donaghmore Poor Law Union |
| 5490 | Laois Local Studies | | 1851-1896 | Order Books of the Petty Sessions, Stradbally:Novemb... | Petty Sessions Records |
| 1668 | Leitrim Local Studies Department | BG122/AA/ | 1843-1844
1848-1849
1851-1858
1863-1864 | Rough Minute Books:1 - July 1843 - August 18442 - De... | Mohill Poor Law Union |
| 22296 | Leitrim Local Studies Department | | 1851-1897 | Ballinamore Petty Sessions:Accounts Book, 1859-1897C... | |
| 22341 | Leitrim Local Studies Department | | 1851-1882 | Misc. 41. Ballinamore Petty Sessions, Document Book ... | Miscellaneous Records, Leitrim |
| 107 | Limerick Archives | LA L/MP | 1819-1851 | Commissioners for the Improvement of the Parish of S... | Limerick Corporation |
| 13143 | Limerick Museum | AQNO (0000.1764) | 1851 | Newspaper page: 'Illustrated London News', 6 Septemb... | |
| 1783 | Louth County Archives | | 1851-1861 | Ardee Poor Law Union, Minute Books: 1 April 1851 - ... | Ardee Poor Law Union |
| 5734 | Louth County Archives | 97-108 | 1851-1924 | Minute Books:97 December 1913 - June 191498 June 191... | Ardee Poor Law Union |
| 5736 | Louth County Archives | 130-136 | 1851-1899 | Labourers' Acts Minute Books:130 1889 - 1890131 ... | Ardee Local Authority Records |
| 14130 | Louth County Archives | | 1851 | Rental and account of the estate of Philip Doyne, Es... | |
| 14132 | Louth County Archives | | 1851 | Rental and account of the estate of Sir Frederick G.... | |
| 18473 | Maynooth University and St Patrick's College, Maynooth | PP/2 | 1851-1922 | Includes correspondence of Eliza, Georgiana and Fred... | The Wardell Archive |
| 20620 | Meath Local Studies and Family History Department | Box E/ | 1851 | 8 Lease of land at Kilkriffin by Sir Raeph Howard to... | Mountainstown Documents |
| 21519 | Monaghan County Museum | | 1851 | O1-5 Photocopy 3 letters and 1 envelope includes let... | Moorehead Letters |
| 21520 | Monaghan County Museum | | 1851 | 03-4 Mother to Martha, undated. Family news. Letter ... | Moorehead Letters |
| 21521 | Monaghan County Museum | | 1851 | P1-4 Two photocopied letters from her sister, family... | Moorehead Letters |
| 21522 | Monaghan County Museum | | 1851 | Q1-3 Photocopy letter and envelope. 27 January 1851.... | Moorehead Letters |
| 21523 | Monaghan County Museum | | 1851 | R1-3 Photocopied letters and envelope 22 February 18... | Moorehead Letters |
| 21527 | Monaghan County Museum | | 1851 | U1-2 Photocopied letter and envelope. Thomas Moorhea... | Moorehead Letters |
| 21528 | Monaghan County Museum | | 1851 | V1-2 Photocopied letter and envelope, 12 December 18... | Moorehead Letters |
| 21589 | Monaghan County Museum | | 1851 | 1988 102 a-b2 b1-2 letter dated 2 January 1851 signe... | Moorehead Letters |
| 3273 | National Archives of Ireland | BG111AZC/ | 1851-1855 | Lismore Poor Law Union, Return of Elections to the B... | Lismore Poor Law Union |
| 15551 | National Archives of Ireland | 999/168/2 | 1851-1956 | Notes concerning the descendants of Edmund and Marth... | Small Private Accessions |
| 15562 | National Archives of Ireland | 999/177 | 1851 | Photocopy of certified coy of portions of the census... | Small Private Accessions |
| 1496 | National Library of Ireland | Ms2071 | 1848-1851 | Includes three letters of Thomas Francis Meagher to ... | |
| 1568 | National Library of Ireland | Ms3528 | 1851-1863 | Account book showing lodgements and payments from th... | |
| 2749 | National Library of Ireland | Ms20954 | 1851 | Nine letters to John D'Alton from his daughter Eliza... | D'Alton Papers |
| 2946 | National Library of Ireland | Ms8783 | 1851-1861 | Letters to Louisa Beaufort, mainly dealing with the ... | Beaufort Papers |
| 2985 | National Library of Ireland | Ms9146 | 1851 | Photocopy of a bond of Mary Thorp, widow, and Samuel... | |
| 3506 | National Library of Ireland | Ms11043 | 1832-1851 | Three documents relating to the Carlow Lunatic Asylu... | Mayo Papers |
| 3519 | National Library of Ireland | Ms11816 | 1833-1851 | Rental of the Domvile estate, County Mayo, 1833-1851... | Domvile Papers |
| 3611 | National Library of Ireland | Ms13115 | 1846-1851 | Thirty letters by Aubrey de Vere to Sara Coleridge, ... | De Vere Papers |
| 3612 | National Library of Ireland | Ms13116 | 1847-1851 | Letters by Sarah Coleridge to Aubrey de Vere on lite... | DeVere Papers |
| 9091 | National Library of Ireland | Mss14328-14332 | 1851-1865 | Five notebooks [of Mrs John Woulfe Flanagan, nee Sus... | O'Loghlen Papers |
| 9121 | National Library of Ireland | Mss14740-14741 | 1849-1851 | Rent Arrears Book of County Clare tenants of Lucius ... | Inchiquin Papers |
| 9336 | National Library of Ireland | Mss23532-23533 | c1851-1862 | Two Account Books of [Arthur?] Fitzmaurice, land age... | FitzMaurice Papers |
| 9348 | National Library of Ireland | Mss 23819-23822 | 1851-1891 | Rent Ledgers of the Kilcash estate of the Marquess o... | Ormonde Papers |
| 9537 | National Library of Ireland | Ms29773(1-40) | 1789-1851 | Accounts of the Bruen family, 1789-1851. There are 4... | Bruen of Oakpark (County Carlow) Papers |
| 10076 | National Library of Ireland | Ms16134 | 1850-1851 | Renal of the estate of Lord Monck, County Wexford, 1... | |
| 10089 | National Library of Ireland | Ms16297 | 1844-1851 | A book of poems by Elizabeth Ashe, Baronstown rector... | |
| 10654 | National Library of Ireland | Mss16699-16701 | 1851-1954 | Two Minute Books of Dr Steeven's Hospital Dublin wit... | |
| 10783 | National Library of Ireland | Ms20605 | 1850-1851 | Includes copies of letters relating to Arabella [Arb... | Rowan Papers |
| 11550 | National Library of Ireland | MsG389/1 | 1851 | Letter to John (O) Daly from [Mrs] M E Mackesey, Cas... | |
| 11590 | National Library of Ireland | Ms12373 | 1850-1851 | Castlebar Poor Law Union Minute book, 25 May 1850-11... | |
| 11606 | National Library of Ireland | Ms12239 | 1851 | Belmullet Poor Law Union Minute Book, 22 May 1851-27... | |
| 11613 | National Library of Ireland | Ms12210 | 1850-1851 | Ballina Poor Law Union Minute book, 6 July 1850-1 Fe... | |
| 11614 | National Library of Ireland | Ms12211 | 1851 | Ballina Poor Law Union Minute Book, 1 February 1851-... | |
| 11619 | National Library of Ireland | Ms12212 | 1851-1852 | Ballina Poor Law Union Minute Book, 30 August 1851-2... | |
| 18934 | Offaly Archives | OCL BG164/2 | 1851-1884 | 55 volumes. Parsonstown Rough Minute Books, 1851-188... | Records of Parsonstown Union |
| 6375 | Public Record Office of Northern Ireland | T/1787 | 1729-1851 | Genealogical notes on the Magill family, Donaghey ar... | |
| 6833 | Public Record Office of Northern Ireland | D/2456 | c.1851-c.1890 | Photographs of the Crawford family, c.1851-c.1890. | |
| 8136 | Public Record Office of Northern Ireland | T/1881/1 | 1851
1918 | Copy of the 1851 census returns relating to the Hann... | |
| 6476 | Public Record Office of Northern Ireland | D/1133 | 1851-1904 | Business records of Bessbrook Spinning and Weaving C... | |
| 6496 | Public Record Office of Northern Ireland | D/1270 | 1851 | Letter from Mrs Whitelaw, Lebanon, Pennsylvania, Uni... | Jackson and Whitelaw Papers |
| 6519 | Public Record Office of Northern Ireland | D/1384 | 1851-1854 | Emigrant letters from Margaret Fuller in Adelaide, A... | |
| 8640 | Public Record Office of Northern Ireland | T/616 | 1798-1851 | Copies of notes on the Ekenhead and Lemon families o... | |
| 8652 | Public Record Office of Northern Ireland | T/658/1 | 1821-1851 | Copy of census extracts for County Londonderry, 1821... | |
| 6767 | Public Record Office of Northern Ireland | D/2163 | 1851 | This collection of 3 documents includes a teacher... | |
| 6800 | Public Record Office of Northern Ireland | D/2309 | c.1774-1851 | c.200 documents relating to the Moore family, County... | |
| 7135 | Public Record Office of Northern Ireland | D/2909 | c1830-1851 | 1 volume journal written by Mrs Muir, Paisley, Glasg... | |
| 7164 | Public Record Office of Northern Ireland | D/2992/B/12 | 1843-1851 | Correspondence between Sir James Emerson Tennent and... | |
| 7310 | Public Record Office of Northern Ireland | D/3655 . | 1851-1930 | These papers include, for example: Genealogical note... | Andrews Papers |
| 7794 | Public Record Office of Northern Ireland | MIC/5A | 1831-1851 | Microfilmed copies of census extracts of Londonderry... | |
| 7836 | Public Record Office of Northern Ireland | T/1022 | 1821-1851 | This collection includes genealogical notes on numer... | |
| 7915 | Public Record Office of Northern Ireland | T/1201/8 | 1851 | Typescript copy of a letter from Isabella Heygate, B... | |
| 8038 | Public Record Office of Northern Ireland | T/1573 | 1851-1899 | This collection of 16 documents includes, for exampl... | |
| 8090 | Public Record Office of Northern Ireland | T/1719/1-2 | 1851 | Box containing Mormon genealogical record forms rela... | |
| 8348 | Public Record Office of Northern Ireland | T/2484/1 | 1851 | Extract from the 1851 census of Ireland for the fami... | |
| 8550 | Public Record Office of Northern Ireland | T/3092/ | 1776-1851 | This collection includes, for example: T/3092/1 Copi... | Strutt Papers |
| 8591 | Public Record Office of Northern Ireland | T/412/1 | c.1851 | Copy of a list of members in each tenant's house... | |
| 8619 | Public Record Office of Northern Ireland | T/550 | 1841-1851 | Copy of census abstracts recording old age pension c... | |
| 13145 | Queen's University Belfast Special Collections and Archives | | 1851-1882 | Queen's University in Ireland, Senate Minutes, 1851-... | |
| 21465 | Queen's University Belfast Special Collections and Archives | MS74 | 1851
1922 | MS 1/6 Copy of an autograph song by Charles Wolfe, s... | QUB Miscellaneous Manuscripts |
| 3865 | Religious Society of Friends in Ireland Historical Library | Portfolio 47 | 1775-1851 | Bewley Family Letters: The letters are listed in det... | Handlists/Portfolio |
| 4171 | Religious Society of Friends in Ireland Historical Library | Deed Box XIII | 1851-1861 | Janet Curwen, 35 Molesworth Street, Dublin, wife of ... | Deeds |
| 11096 | Religious Society of Friends in Ireland Historical Library | PM/TipI/A1 | 1851-1910 | Clonmel Preparative Meeting Minutes, 1851-1910, thes... | |
| 22372 | Religious Society of Friends, Cork | | 1851-1879 | Cork Monthly Meeting, Women's Minutes, 1851-1879. | |
| 22371 | Religious Society of Friends, Cork | | 1807-1851 | Cork Monthly Meeting, Women's Minutes, 1807-1851. Th... | |
| 2150 | Representative Church Body Library | Ms96 | 1829-1851 | Register of Tipperary County Infirmary gives names, ... | Tipperary County Infirmary |
| 2187 | Representative Church Body Library | Ms91 | 1851-1930 | Correspondence regarding the Achill Mission Estate. ... | Achill Mission Estate |
| 22094 | Representative Church Body Library | B10 | 1851 | Diocese of Cork, Ross and Cloyne, Visitation Book, 1... | St Fin Barre's Cathedral Cork Archive |
| 25102 | Royal Irish Academy | 24/O/35-37a-c | 1851-1856 | 24/0/37b The Punch Pocket Book, Diary and Memoranda ... | G.H. Kinahan |
| 22692 | South Eastern Education and Library Board Local History Collection | | 1851-1991 | Extracts from the Census of Population relating to t... | Local Studies Collection |
| 19789 | Tipperary Studies | | 1850-1851 | Borrisokane Poor Law Union Rough Minute Book 1850-18... | Borrisokane Poor Law Union |
| 10229 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs7389 | 1851-1893 | Letters from Whitely Stokes and his wife to his fami... | Whitley Stokes Papers |
| 10301 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs4586 | 1846-1851 | Domestic Recipe Book, 1846-1851, the initals D. K[it... | |
| 10375 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs873 | 1851 | Obituary of Anne Devilin, 1851, with an undated rece... | Madden Papers |
| 11163 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs5097/32-3 | 1849-1851 | Returns of Newmarket tenants to be made monthly tena... | O'Brien Family |
| 11224 | Trinity College Dublin, Manuscripts and Archives Department | P 31/6/1-26 | 1842-1851 | H McCreery: Kilkenny Tenants Accounts, 1842-1851 and... | Courtown Papers |
| 11939 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs10248 | 1796-1851 | Correspondence of James Campbell (of Ballyrobin near... | |
| 2079 | UCD Archives | P4 (1-1932) | 1851-1936 | Contains family papers, including correspondence of ... | Hugh Kennedy Papers |
| 24106 | Union Theological College | | 1851-1885 | 'Presbyterian Church in Ireland, General Synod of Ul... | Union Theological College Pamphlet Collection |
| 5968 | Waterford City Archives | HG/3/ | 1773-1851 | Election of Master: 1: Manuscript state of the case ... | Records Relating to the Holy Ghost Hospital |
| 9913 | Waterford County Archives | BG/Kilthom | 1851-1921 | Kilmacthomas Poor Law Union Minute Books. Includes d... | Kilmacthomas Poor Law Union |
| 19286 | Westmeath County Archives Department | | 1851-1855 | Athlone Poor Law Union Rough Minute Books:1 February... | Athlone Poor Law Union |