| 14260 | Alexandra College | | 1850-1975 | Petitions for money in the interest of higher educat... | |
| 14264 | Alexandra College | | 1850-1975 | Printed material on Oxford Colleges for Women. | |
| 13854 | Armagh County Museum | 1965/126 | c1850 | Valentine, c.1850. | |
| 8752 | Ballymena Central Library | U/A(BMO)362.5 | 1844-1850 | Ballymoney Board of Guardian Minutes, copied from th... | Ballymoney Board of Guardian Records |
| 8766 | Ballymena Central Library | U/Lo/(COL)362.5 | 1845-1850 | Coleraine Board of Guardian Minutes, copied from the... | Coleraine Board of Guardian Records |
| 8761 | Ballymoney Library | U/A-BMO-362.5 | 1844-1850 | Ballymoney Board of Guardian Minutes, copied from th... | Ballymoney Board of Guardian Records |
| 20011 | Ballymoney Library | | 1844-1850 | File of extracts from the Minute Books of Ballymoney... | |
| 16205 | Birr Castle Archives | A-W | 1850-1859 | J/20: An invite from Frances Anne, Lady Londonderry,... | The Rosse Papers |
| 16212 | Birr Castle Archives | A-W | 1846-1850
1837 | K/36B: Includes typescript copies of letters from th... | The Rosse Papers |
| 16756 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1822-1850 | Lismore Estate:Letter Book, 1822-1850 with index to ... | Bolton Library Archive |
| 16770 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1850-1862 | Lismore Estate?Letter Book, 1850-1862, 1 volume. | Bolton Library Archive |
| 16836 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1850-1877 | Clonbeg Burial Register 1850-1877, 1 volume. | Bolton Library Archive |
| 16839 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1850-1877 | Clonbeg parish, Baptismal Register, 1850-1877, 1 vol... | Bolton Library Archive |
| 16843 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1845-1850 | Marriage Register, Ballintemple, 1845-1850, 1 volume... | Bolton Library Archive |
| 16902 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1757-1834
1850-1874 | Vestry Minute Books, Shronell: 1757-1834, with inser... | Bolton Library Archive |
| 14466 | Cavan County Archives | | 1799-1850 | Digitised copy of estate rental, lands owned by a Mi... | Enery Estate Rental |
| 14468 | Cavan County Archives | | 1850-1899 | Photograph album from the Farnham Estate, including ... | Farnham Photograph Album |
| 14379 | Clare County Archives | | 1850-1950 | Butler-Graham Photograph Collection:Contains photogr... | Clare County Library Photographic Archive |
| 14382 | Clare County Archives | | 1850-1950 | Killaloe Heritage Centre Collection:A large collecti... | Clare County Library Photographic Archive |
| 16956 | Clare County Archives | | 1850-1865
1901-1902 | Rough Minute Books:August 1850 - March 1851March 185... | Corofin Poor Law Union |
| 16955 | Clare County Archives | | 1850-1924 | Minute Books:March 1850 - August 1850August 1850 - M... | Corofin Poor Law Union |
| 17009 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/1/1850 Letter, enclosure, Revd. M Sheehan, ... | Bishop W. Keane Papers |
| 17010 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/2/1850 Handwritten extracts from A Gould's ... | Bishop W. Keane Papers |
| 17011 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/3/1850 Letter, Revd. M Sheehan, Youghal to ... | Bishop W. Keane Papers |
| 17108 | Cloyne Diocesan Archive (RC) | Box J | 1850 | 1796.06/56/1858 Note `Foundation of the Convent of ... | Bishop W. Keane Papers |
| 17012 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/4/1850 Letter, Revd. M O'Brien, Mitchelstow... | Bishop W. Keane Papers |
| 17013 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/5/1850 Letter. Revd. M O'Brien, Mitchelstow... | Bishop W. Keane Papers |
| 17014 | Cloyne Diocesan Archive (RC) | Box D | 1796
1850 | 1796.05/6/1850 Letter, Revd T. Lee, Macroom, to Revd... | Bishop W. Keane Papers |
| 17015 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/7/1850 Letter, Revd M. O'Brien, Mitchels... | Bishop W. Keane Papers |
| 17029 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.06/1/1850 Letter Angelina Gould Youghal to Rev.... | Timothy Murphy Papers |
| 17030 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.07/16/1850 Letter from a parishioner of Mr Davi... | Timothy Murphy Papers |
| 17031 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.05/60/1850 Letter from the Rev. O'Hea, Rosscarb... | Timothy Murphy Papers |
| 17032 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.03/2/1850 Letter from Bishop Murphy, Adelaide t... | Timothy Murphy Papers |
| 22996 | Cork City and County Archives | U140/Class E/ | 1850-1851 | Day82/11 Medical Reports 1850-1851; invitation to Mr... | Dowden Papers |
| 23221 | Cork City and County Archives | U15B/ | 1850 | P/C 61 L. Dubos, Brentford Butts, Seagrave Place, Bo... | Thomas Hewitt Papers |
| 19861 | Erasmus Smith Schools Archives | | 1650-1850 | Material relating to the establishment of the Trust ... | Erasmus Smith Archives |
| 19869 | Erasmus Smith Schools Archives | | 1850-1940 | Letters, grazing agreements, ejectments, documents f... | Erasmus Smith Archives |
| 19908 | Erasmus Smith Schools Archives | | 1850-1881 | Governmental and Royal Commission reports and bills ... | Erasmus Smith Archives |
| 1435 | Fingal County Archive | GJ/4/1-GJ/4/20 | 1836-1850 | Grand Jury Presentments:GJ/4/1 1836 Easter Presentme... | County of Dublin Grand Jury |
| 5637 | Galway County Council Archives | GPL/4 | 1850-1895 | Minute Books:1 24 May 1850 - 25 January 18512 7 Febr... | Mountbellew Poor Law Union |
| 20479 | Galway County Council Archives | | 1850-1887 | Town Commissioners, Minute Books:May 1850-June 1859 ... | Ballinasloe Urban District Council & Town Commissioners |
| 532 | Irish Church Missions | | 1850-1967 | Salary List: January 1928-November 1937. Cash Book,... | |
| 5134 | Irish Jesuit Archives | J27/ | 1845-1850 | Various:159 10 May 1845 -[ ] 1850. A file relating t... | Papers of Fr Matthew Russell, SJ (1834 - 1912) |
| 5595 | Irish Labour History Museum | | 1850-1894 | Minute Books, 1850-1894. | Society of St Anne and Dublin Operative Bakers Friendly Society |
| 2233 | Irish Theatre Archive | ITA/46 | 1850-1899
1900-1949 | Picture postcards of popular actors issued as 'S... | Picture postcards of popular actors |
| 21725 | Kerry Diocesan Archives (RC) | E59 | 1850 | Cholera in Cahirciveen, Mother Joseph, 1850. | Bishop Cornelius Egan, 1825 - 1856 |
| 21727 | Kerry Diocesan Archives (RC) | E62 | 1850 | Mother Joseph, 1850. | Bishop Cornelius Egan, 1825 - 1856 |
| 3347 | Kilkenny Local Studies Department | BG57A | 1850-1911 | Minute Books:12. August 1850-February 185115. Februa... | Castlecomer Poor Law Union |
| 20994 | King's Hospital School | 65-82 | 1850 | 78 Chadwicks Noddstown, 1850. | King's Hospital Records |
| 1669 | Leitrim Local Studies Department | BG122/CA/ | 1842-1850
1872-1897 | Accounts, General Ledgers:1 - 1842-18462 - 1846-1848... | Mohill Poor Law Union |
| 126 | Limerick Archives | LA BG/71/A | 1850-1922 | Minute Books:1. April 1850 - November 18502. Novembe... | Croom Board of Guardian Records |
| 127 | Limerick Archives | BG 71/AA | 1850-1886 | Rough Minute Books:1. April 1850 - November 18502. N... | Croom Board of Guardian Records |
| 1780 | Louth County Archives | BG/80/AA/ | 1843-1850 | Dundalk Poor Law Union, Rough Minute Books: 208 Apr... | Dundalk Poor Law Union |
| 18589 | Maynooth University and St Patrick's College, Maynooth | PP/15 | 1674-1850 | Consists of leases, mortgages and a marriage settlem... | The Molyneux Archive |
| 20295 | Meath Local Studies and Family History Department | Box A/ | c.1850-c.1860 | 17 L.E.S. Scott versus Williams, 7 documents, 1850s ... | Mountainstown Documents |
| 22824 | Methodist Historical Society of Ireland | | 1850-1865 | Athlone and area Methodist Circuit: Records, 1850-18... | |
| 1844 | Monaghan County Library Genealogy and Local History Department | | 1850-1957 | County Infirmary, Monaghan:Matron's Daily Regist... | County Monaghan Local Authority Records |
| 21515 | Monaghan County Museum | | 1850 | K1-3 Photocopy letter and envelope. E.I. Foster to M... | Moorehead Letters |
| 21516 | Monaghan County Museum | | 1850 | L1-2 Photocopy letter and envelope. Unsigned to Mart... | Moorehead Letters |
| 21517 | Monaghan County Museum | | 1850 | M1-3 Photocopy letter and envelope. E.I. Foster to M... | Moorehead Letters |
| 21518 | Monaghan County Museum | | 1850 | N1-3 Photocopy letter and envelope. E.I. Foster to M... | Moorehead Letters |
| 21590 | Monaghan County Museum | | 1850 | 1988 103a-b3 letter dated 12 /Feb/ 1850 and signed M... | Moorehead Letters |
| 765 | National Archives of Ireland | 999/680/ | 1850-1906 | 5: 8 May 1850, Transfer, appointment and declaration... | |
| 3930 | National Archives of Ireland | | 1850 | Maps and Plans: Hospital Etching of the Chapel Ceili... | Royal Hospital Kilmainham |
| 11417 | National Archives of Ireland | HA130/1 | 1850-1963 | Dublin: Foundling Hospital Estate, Workhouse Book, 1... | Department of Health |
| 11513 | National Archives of Ireland | | 1823-1850 | Miscellaneous Receipts for Mrs Byrne, 1823-1850. | Byrne Papers |
| 15328 | National Archives of Ireland | 99/56/5/6 | 1850 | Carhampton Papers. Portarlington and members of the ... | Family and estate records. 1611-1948 |
| 15499 | National Archives of Ireland | 999/113/4 | 1850 | Copy surrender of lease for remainder of 300 years b... | Small Private Accessions |
| 15616 | National Archives of Ireland | 999/230 | 1620-1850 | Family tree and genealogical notes concerning the Av... | Small Private Accessions |
| 23991 | National Archives of Ireland | CIF L3/1850 | 1850 | William Lavery assault on his wife. It was noted tha... | Criminal Index Files |
| 1509 | National Library of Ireland | Ms2106 | 1836-1850 | Journal of three tours of the Continent by Helen For... | |
| 1519 | National Library of Ireland | Ms2081 | 1850-1950 | An album belonging to an unidentified male containin... | |
| 1525 | National Library of Ireland | Ms2270 | 1850-1899 | Extracts of letters from Mrs Catherine Foran of Otta... | |
| 1547 | National Library of Ireland | Ms3069 | 1850-1899 | 'The tragedy of Murty Oge O'Sullivan Beare, shot May... | |
| 1701 | National Library of Ireland | Ms13340 | 1779-1850 | Rent Roll and other documents.These include: Rent Ro... | |
| 2363 | National Library of Ireland | Ms12932 | c1850 | Susanna Barclay, medical receipts. Indexed book of r... | |
| 2498 | National Library of Ireland | Ms13400 | c1850 | Documents, mainly letters to Lord and Lady Monteagle... | Monteagle Papers |
| 2433 | National Library of Ireland | Ms3639 | 1838-1850 | Commonplace Book entitled 'Odds and ends, or sna... | |
| 2507 | National Library of Ireland | Ms13077 | 1850-1916 | Letters and other documents which include: Six lette... | Casement Papers |
| 2594 | National Library of Ireland | Ms4329 | 1825-1850 | Wages' Book of male and female servants employed by ... | |
| 2646 | National Library of Ireland | Ms8001 | 1850-1899 | A large collection of letters to John O'Leary from v... | |
| 2681 | National Library of Ireland | Mss10000-10006 | 1850-1950 | A large collection of letters to Edmund Downey, main... | Edmund Downey Papers |
| 2751 | National Library of Ireland | Ms20956 | c1844-1850 | Letters to John D'Alton from his daughter Johanna of... | D'Alton Papers |
| 2971 | National Library of Ireland | Ms8917 | 1791-c1850 | Documents relating to the estates of the Hutchinson ... | Hutchinson Papers |
| 3076 | National Library of Ireland | Ms10074 | c1850 | Statement of costs in the case of the estate of Rich... | |
| 3078 | National Library of Ireland | Ms14089 | c1850 | List of leases relating to the estates of the 4th Ea... | |
| 3527 | National Library of Ireland | Ms11881 | 1815-1850 | Account book of Slane Dispensary, 1815-1850. | Townley Hall Papers |
| 3620 | National Library of Ireland | Ms12766 | 1850 | Ennistymon (County Clare) Union Letter Book, mostly ... | |
| 3731 | National Library of Ireland | Ms13346 | 1824-1850 | Correspondence of Maria Edgeworth and Thomas Spring-... | Monteagle Papers |
| 6912 | National Library of Ireland | Ms18961 | 1850-1861 | Rent Ledger of the estate of Charles Joseph Lynch, P... | |
| 6922 | National Library of Ireland | Ms12612 | 1849-1850 | Westport Poor Law Union Minute Book, 10 November 184... | |
| 9003 | National Library of Ireland | Ms13645(11-15) | 1809-1850 | Letters to and from Maurice O'Connell, correspondent... | O'Connell Papers |
| 9052 | National Library of Ireland | Ms13895 | c1850-1859 | Eleven letters to Mrs John Woulfe Flanagan (nee Susa... | O'Loghlen Papers |
| 9094 | National Library of Ireland | Ms14336 | c1830-1850 | Account book recording wages, domestic and farm expe... | |
| 9239 | National Library of Ireland | Ms15558 | 1850 | Xerox copies of two letters from William Cleburne, C... | |
| 9267 | National Library of Ireland | Ms15763 | 1837-1843
1850
1853 | Correspondence of Viscount and Lady Hardinge, 1837-1... | |
| 9282 | National Library of Ireland | Ms22997 | 1850-1950 | Autograph letter to James Swaine [? County Carlow] f... | |
| 9542 | National Library of Ireland | Ms29777(7) | 1830-1850 | Census of tenants and undertenants, Ballytiglea, 183... | Bruen of Oakpark (County Carlow) Papers |
| 9731 | National Library of Ireland | Ms18246 | 1849-1850 | Account of surveys of holdings in County Longford, s... | Dimond Papers |
| 10076 | National Library of Ireland | Ms16134 | 1850-1851 | Renal of the estate of Lord Monck, County Wexford, 1... | |
| 10107 | National Library of Ireland | Ms16418 | 1841-1850 | Rent Ledger of the Bray, Calary and Kilmacanoge area... | Hodson Papers |
| 10753 | National Library of Ireland | Ms19921-19922 | c.1850-1880 | Two Registers of tenants of the estates of the Dukes... | Leinster Papers |
| 10783 | National Library of Ireland | Ms20605 | 1850-1851 | Includes copies of letters relating to Arabella [Arb... | Rowan Papers |
| 10787 | National Library of Ireland | Ms20627 | 1827-1850 | Letters to and by Michael Studdert, Rehy Park, Kilru... | Studdert Papers |
| 10893 | National Library of Ireland | Ms21708 | [c1850?] | Letter from 1st Marquis of Dufferin of Ava relating ... | |
| 10935 | National Library of Ireland | Ms22249 | [c1850?] | Letter from M Martin, Dublin to [Mary --?] concernin... | |
| 11020 | National Library of Ireland | Ms17778 | c1850-1860 | Lyrical poems mostly copies of compositions by Miss ... | |
| 11584 | National Library of Ireland | Ms12209 | 1850 | Ballina Poor Law Union Minute Book, c2 February 1850... | |
| 11590 | National Library of Ireland | Ms12373 | 1850-1851 | Castlebar Poor Law Union Minute book, 25 May 1850-11... | |
| 11602 | National Library of Ireland | Ms5739 | 1849-1850 | Minute book of Newport Union of Poor Law Commissione... | |
| 11613 | National Library of Ireland | Ms12210 | 1850-1851 | Ballina Poor Law Union Minute book, 6 July 1850-1 Fe... | |
| 11954 | National Library of Ireland | Mss12473-12481 | 1850-1860 | Claremorris Poor Law Union Minute Books: Ms12,473 1... | Claremorris Poor Law Union |
| 11853 | OPW-Maynooth University Archive and Research Centre (OMARC) | Boxes 26-45 | 1850-1996 | Children's Sunshine Home: Photographs Boxes 26-4... | Airfield Archive |
| 21396 | Our Lady's Hospital, Cork | | 1850-1890 | Copies of a newspaper advertisements, 1850-1890, for... | |
| 16692 | Presentation Sisters Congregational Archives | | 1850-1930 | E. Administration. A small section which includes ac... | Presentation Convent, Dublin |
| 6309 | Public Record Office of Northern Ireland | COM/ | c.1850-1968 | Ministry of Commerce files of the Northern Ireland G... | Northern Ireland Ministry of Commerce Papers |
| 6345 | Public Record Office of Northern Ireland | D/3239 | 1850-1946 | The records of O'Kane Solicitors, Belfast, include t... | |
| 6336 | Public Record Office of Northern Ireland | D/1088 | c1810-1850 | D/1088/22; D/1088/26 Letters about the Ulster Femal... | Mark Cassidy Papers |
| 6619 | Public Record Office of Northern Ireland | D/1748 | 1764-1850 | This collection includes the correspondence and pape... | Tennent Papers |
| 6811 | Public Record Office of Northern Ireland | D/2362 | 1850-1930 | Typescript copy notes and papers of Helena Richardso... | |
| 7918 | Public Record Office of Northern Ireland | T/1209/1 | 1630-1850 | Copy pedigree of the Spence family, County Fermanagh... | |
| 7924 | Public Record Office of Northern Ireland | T/1233/1 | c1850 | Copy of a map of Hamiltonsbawn, County Armagh, showi... | |
| 8315 | Public Record Office of Northern Ireland | T/2397/1 | 1830s-1850s | Copies of sketches of settlements in Victoria and Ta... | |
| 7052 | Public Record Office of Northern Ireland | D/2651 | c.1720-c.1850 | c.400 documents relating to the Ker family of Portav... | Ker Papers |
| 7063 | Public Record Office of Northern Ireland | D/2682 | 1850-1963 | This collection of papers relating to the Blake fami... | |
| 7242 | Public Record Office of Northern Ireland | D/3330 | c.1850-1960 | This collection includes: 4 letters written by Janet... | Baird Papers |
| 7360 | Public Record Office of Northern Ireland | D/3819 | 1850-1920 | The McDonnell papers consist of c850 documents and 5... | |
| 7545 | Public Record Office of Northern Ireland | D/906/ | 1850
1857 | D/906/365/1 An account of an Irish woman's visit... | Perceval Papers |
| 7741 | Public Record Office of Northern Ireland | MIC/13 | 1850-1865 | Microfilmed copies of 4 volumes which include lists ... | |
| 7773 | Public Record Office of Northern Ireland | MIC/33 | 1850-1872 | Microfilmed copies of emigrant letters from Joseph a... | Barr Family Papers |
| 7804 | Public Record Office of Northern Ireland | MIC/65/2 | 1850 | Microfilmed copy of the commonplace book of press cu... | Rowan-Hamilton (Killyleagh) Papers |
| 7937 | Public Record Office of Northern Ireland | T/1268/1-6 | c.1740-c.1850 | Non-Subscribing Presbyterian Church, Downpatrick, Co... | |
| 8098 | Public Record Office of Northern Ireland | T/1738/1 | 1714-c.1850 | Copy of a volume which includes burial entries for t... | |
| 8203 | Public Record Office of Northern Ireland | T/2054/1 | 1850 | Copy of a letter from Mrs Nolan, Clara Upper, County... | |
| 8237 | Public Record Office of Northern Ireland | T/2150/1 | 1850-1950 | Genealogical notes on the Anderson family, Sixmilecr... | |
| 8322 | Public Record Office of Northern Ireland | T/2418/ | 1850-1899 | Copies of the Lawrence photographs from the National... | |
| 7825 | Public Record Office of Northern Ireland | SCH/ | 1850-1970 | School records, including many girls' schools, 1... | School Records |
| 8381 | Public Record Office of Northern Ireland | T/2571 | 1850-1925 | Copies of personal correspondence relating to the Ri... | |
| 8430 | Public Record Office of Northern Ireland | T/2663 | c1850-c1912 | This collection of 24 documents includes, for exampl... | |
| 8483 | Public Record Office of Northern Ireland | T/2799/ | 1850-1936 | This collection of c.30 documents includes, for exam... | |
| 8555 | Public Record Office of Northern Ireland | T/3252 | 1823-1850 | Copy of a letter from Ann Crawford, Bombay, India, t... | |
| 8578 | Public Record Office of Northern Ireland | T/3664 | 1850 | Copy of a letter from Marianne Gurd, Montreal, Canad... | |
| 8666 | Public Record Office of Northern Ireland | T/715 | 1758-1850
1821 | This collection includes the following: A copy of a ... | |
| 482 | Religious Society of Friends in Ireland Historical Library | Portfolio 7B | 1685-1850 | Miscellaneous: 16 Letter from Ann Wigham to Olive G... | Handlists/Portfolio |
| 484 | Religious Society of Friends in Ireland Historical Library | Portfolio 8B | 1687-1850 | 8 Report from Limerick Women's Meeting to Munster M... | Handlists/Portfolio |
| 671 | Religious Society of Friends in Ireland Historical Library | QMI/B9 | 1841-1850 | Women's Meeting Minutes and Epistles from America, 1... | Leinster Quarterly Meetings |
| 1123 | Religious Society of Friends in Ireland Historical Library | Mss Box 40-41 | 1750-1850 | Mss Box 40: Leaves from Diary of Mary Leadbeater, no... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1285 | Religious Society of Friends in Ireland Historical Library | | 1850-1950 | Art: Edith Webb, 1854-1924, portrait in oils unframe... | Museum Collection |
| 1286 | Religious Society of Friends in Ireland Historical Library | | 1800-1850 | Art: Sarah Deaves, born 1800, and her daughter Sally... | Museum Collection |
| 4193 | Religious Society of Friends in Ireland Historical Library | Deed Box XIV/Folder 3:6 | 1850 | Elizabeth Haughton, Carlow: Signature to surrender o... | Deeds |
| 11123 | Religious Society of Friends in Ireland Historical Library | MM/XVIM6/Reel 42 | 1816-1850 | Richhill Monthly Meeting, marriage certificates, 181... | |
| 2186 | Representative Church Body Library | Ms590 | 1850-1899 | Commonplace book of Anne Elizabeth Maguire, (?Trim, ... | Anne Elizabeth Maguire |
| 2195 | Representative Church Body Library | Ms173 | 1741-1850 | Letters and papers of the Ussher family of County Wa... | Letters and papers of the Ussher family |
| 23717 | Representative Church Body Library | | 1850-1955 | Loose material in cardboard box.Typescript history o... | Young Women's Christian Association (YWCA) |
| 13850 | Sligo Archives Service | | 1850 | Rental of the estate of Godfrey Brereton in the baro... | Brereton Estate |
| 13851 | Sligo Archives Service | Estates volume 5 | 1850 | Rental of the Sligo estate of Henry Irwin (with maps... | Irwin Estate |
| 13852 | Sligo Archives Service | Estates Volume 5 | c1850 | Rental of the estate of Jeremiah Jones in the barony... | Jones Estate |
| 13853 | Sligo Archives Service | | c1850 | Rental of the late Owen Lloyd, c. 1850. | Lloyd Estate |
| 24320 | Tipperary County Archives | | 1850-1858 | Minute Book, General Committee Clonmel Corporation: ... | Clonmel Corporation |
| 13140 | Tipperary Museum of Hidden History | AQNO1995.496 | 1850 | Lease, Viscount Lismore to Grace Heffernan, Coolanur... | |
| 13141 | Tipperary Museum of Hidden History | AQNO1995.504 | 1850 | Lease, Viscount Lismore to Ellen Flynn, Bantyre, 185... | |
| 3079 | Tipperary Studies | | 1850-1923 | Minute Books:June 1850-May 1851May 1851-April 1852Ap... | Borrisokane Poor Law Union |
| 19788 | Tipperary Studies | | 1850-1906 | Workhouse Record of Births:1850-1906 | Borrisokane Local Authority Records |
| 19789 | Tipperary Studies | | 1850-1851 | Borrisokane Poor Law Union Rough Minute Book 1850-18... | Borrisokane Poor Law Union |
| 6883 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs7337/1-87 | 1815-1850 | Family correspondence of Louisa Clements, wife of He... | Clements Papers |
| 6897 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs5111 | 1822-1850 | Autograph Album of poems and drawings kept by Elizab... | Arnold Family |
| 10207 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs6426 | 1850-1860 | Commonplace Books of Catherine Eliza Groves (1830-19... | Groves Papers |
| 10349 | Trinity College Dublin, Manuscripts and Archives Department | TCDMss10047/20 | c.1806-c.1850 | Correspondence of Helena Perceval, later Graves, fro... | Graves Papers |
| 10377 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs10354/15-16 | 1850-1950 | Xeroxes of photographs of Ms Margaret Dobbin (1786-1... | |
| 10411 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs5116 | 1798
1850
1856
1911 | Account of the rebellion of 1798 in Wexford dicated ... | Arnold Family |
| 10420 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs5007b | 1850-1898 | `The Book of Sundays; being a record of certain Sund... | Arnold-Forster |
| 2349 | UCD Archives | P23 | 1728-1850 | A small collection of papers mainly of Richard Lalor... | Sheil and Lalor Families |
| 24156 | Union Theological College | | 1850 | Notes on Mrs Magee's bequest of £5000 each to the H... | |
| 24181 | Union Theological College | RRB-2-15A | 1850-1890
1980 | J.T. Carson, 'The Rev. James Foster of Newmills,... | |
| 18410 | University of Galway Archives | LE28 | c.1850-c.1899 | Bound volume containing a rental of the lands of Wil... | Rental of the lands of William and Thomas H. Burke |
| 13142 | Waterford and Lismore Diocesan Archives (RC) | | 1850-1859 | Contents of box marked 1850-1859 includes: Dispensat... | |
| 9934 | Waterford County Archives | | c1850-1920 | 2 tin deed boxes containing case papers relating to ... | Lismore Castle Papers |
| 19187 | Westmeath County Archives Department | | 1849-1850 | Mullingar Poor Law Union Reports:9 August 1849-28 Fe... | Mullingar Poor Law Union |
| 19298 | Westmeath County Archives Department | | 1850 | 24 Copy of settlement on the marriage of Robert Gerr... | Howard Bury Papers |
| 22795 | Wicklow Library and Archives | | 1850-1915 | Rathdrum Workhouse, Indoor Admissions and Discharge ... | Rathdrum Poor Law Union |