| 5093 | Irish Architectural Archive | 97/84/Box 59 | 1684-1750 | Rent Books relating to [Castletown], 1684-1685; 1740... | Castletown Papers |
| 5105 | Irish Architectural Archive | 97/84/Box 71 | 1750-1776 | Large deeds, c.1750-1776. | Castletown Papers |
| 8 | Irish Dominican Congregation Archives | A19 | 1750 | List of Sisters in 1750 from letters copied by Fr Hu... | Dominican Archives, Cabra |
| 34 | Irish Dominican Congregation Archives | A61 | 1750 | Original manuscript, 3 pages, which is an extract fr... | Dominican Archives, Cabra |
| 11827 | Kilkenny Local Studies Department | CR/I/99 | 1730-1750 | Lease and its counterpart, past to Mary Cormick, wid... | |
| 23215 | Maynooth University and St Patrick's College, Maynooth | SH17 | 1737-1750
1821 | Collections of Historical and Various Subjects, volu... | Shearman Papers |
| 10018 | National Archives of Ireland | | 1750 | Against Tories, Robbers and Rapparees, by name, incl... | Printed Proclamations |
| 15569 | National Archives of Ireland | 999/178 (l) | 1750 | Will of Catherine Starratt, Strabane, Co. Tyrone. Pr... | Small Private Accessions |
| 15617 | National Archives of Ireland | 999/232 | c.1750-1976 | Family tree of the Coyle family of Castleblayney, Co... | Small Private Accessions |
| 959 | National Library of Ireland | Ms11341 | c1750 | Rentals of the estate of Roundwood, c1750. | Hatch Papers |
| 982 | National Library of Ireland | Ms11452 | c1700-1750 | Rent and quit rent accounts relating to the Flower f... | Flower Papers |
| 1551 | National Library of Ireland | Ms3100 | 1750-1799 | A memoir of John Vesey, Archbishop of Tuam, giving t... | |
| 1934 | National Library of Ireland | Ms4583 | 1750, 1761 | Collection includes a contemporary copy of a decree ... | |
| 2622 | National Library of Ireland | Ms11461 | 1723-1750 | Accounts relating to servants of the Flower family a... | Flower Papers |
| 2996 | National Library of Ireland | Ms9367 | 1702-1750 | Rentals and other papers, 1702-1750. These include r... | Domvile Papers |
| 3019 | National Library of Ireland | Ms9631 | 1750-1773 | Rental ledger of Walter Woulfe, concerning property ... | Mansfield Papers |
| 3021 | National Library of Ireland | Mss 9635-9636 | 1742-1750, 1753-1773 | 2 rent ledgers of George Lattin, Mauricetown, County... | Mansfield Papers |
| 3520 | National Library of Ireland | Ms11818 | 1750-1753 | Rentals and estate accounts including rentals of Sir... | Domvile Papers |
| 9740 | National Library of Ireland | Ms18319 | 1730-1750 | Typescript copy of the marriage entries in the regis... | |
| 10770 | National Library of Ireland | Ms20364 | c1750 | Letter to Elizabeth Countess of Hyndford from Lady M... | O'Hara Papers |
| 6599 | Public Record Office of Northern Ireland | D/1700 | c1750-1960 | Correspondence of the Crawford family, c1750-1960. ... | Crawford Papers |
| 7845 | Public Record Office of Northern Ireland | T/1054/2 | 1750-1771 | Copy of a list of tenants on the Burges estate, Coun... | |
| 8356 | Public Record Office of Northern Ireland | T/2509 | 1750-1809 | Manuscript notes on the Byrne family of Lurgan, Coun... | |
| 7011 | Public Record Office of Northern Ireland | D/2523 | c.1750-1890 | c.50 documents comprising of rentals and testamentar... | |
| 7050 | Public Record Office of Northern Ireland | D/2649 | c.1750-1968 | The papers of Alwyn S. Craig Solicitors, Londonderry... | |
| 7325 | Public Record Office of Northern Ireland | D/3694 | 1750-1931 | 13 volumes and c.200 documents relating to various f... | |
| 7891 | Public Record Office of Northern Ireland | T/1135 | 1703-1750 | This collection includes copies of the following doc... | |
| 7474 | Public Record Office of Northern Ireland | D/4131 | c.1750-1994 | 168 boxes of papers of the Gore-Booth family. Much o... | Lissadell Papers |
| 7953 | Public Record Office of Northern Ireland | T/1314/1 | 1750-1950 | Pedigree of the Leitch family, Ardstraw, County Tyro... | |
| 7964 | Public Record Office of Northern Ireland | T/1345/2 | 1750-1885
1672-1887
1770-1893 | Pedigree of the Russell family, Newry, County Down, ... | |
| 8122 | Public Record Office of Northern Ireland | T/1859 | 1750 | Genealogical notes and correspondence relating to th... | |
| 8131 | Public Record Office of Northern Ireland | T/1876/1-6 | c1750-1955 | Copies of emigrant letters, pedigree and genealogica... | |
| 8209 | Public Record Office of Northern Ireland | T/2072/2 | 1750-1930 | Pedigree of the Sinclair family, Kinneary House, Kin... | |
| 8270 | Public Record Office of Northern Ireland | T/2246/1 | 1750-1900 | Genealogy of the Atkinson family, Crowhill, Portadow... | |
| 8389 | Public Record Office of Northern Ireland | T/2592/1-2 | 1750-1968
1760-1921 | Genealogical notes on some of the ancestors of Thoma... | |
| 8606 | Public Record Office of Northern Ireland | T/481/1 | 1750-1872 | Copies of typed notes on the Higgins family, no addr... | |
| 782 | Religious Society of Friends in Ireland Historical Library | QMII/G1-2 | 1750-1811 | Sufferings and Tithes: QMII/G1 Sufferings of Friend... | Munster Quarterly Meeting |
| 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. |
| 3554 | Religious Society of Friends in Ireland Historical Library | MM/XIIE1/Reel 20 | 1750-1853 | Miscellaneous letters mainly relating to religious a... | |
| 24298 | Tipperary County Archives | | 1750-1770 | Index to Corporation Minutes, c.1750 - c.1770 | Clonmel Corporation |
| 10379 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs7577/1-101 | 1750-1773 | Letters of a personal nature from Arthur Gore, 2nd E... | Arran Papers |
| 13008 | UCC Special Collections & Archives | U116 | 1750 | Manuscript entitled 'An accurate treatise of the who... | |
| 1619 | UCD Archives | | 1750-1861 | O'Connell Papers: Letters, accounts, legal papers of... | O'Connell Papers |
| 2345 | UCD Archives | P12 | 1750-1895 | Collection includes: Letters from Abigail Goold, of ... | O'Connell Papers |