| 14241 | Alexandra College | | 1800-1899 | Book with cuttings and poems, only one third used, 1... | |
| 19167 | Armagh Robinson Library | KE/IV/ 7 | 1800 | Diaries, Volume 2: 1798-1802Diary entry noting, '... | Alexander Hamilton Papers |
| 19168 | Armagh Robinson Library | KE/IV/ 7 | 1800 | Diaries, Volume 2: 1798-1802Diary entry noting, '... | Alexander Hamilton Papers |
| 16171 | Birr Castle Archives | A-W | 1800-1840 | F/11: Notes by Sir Laurence Parsons on the history a... | The Rosse Papers |
| 16179 | Birr Castle Archives | A-W | 1788-1800 | H/43: Letters to Lord and Lady Hawke from 3 of the S... | The Rosse Papers |
| 16180 | Birr Castle Archives | A-W | 1786-1800 | H/44: Letters to Lord and Lady Hawke from other Saye... | The Rosse Papers |
| 16185 | Birr Castle Archives | A-W | 1790-1800 | H/50: 9 envelopes of letters to Lord and Lady Hawke ... | The Rosse Papers |
| 16189 | Birr Castle Archives | A-W | 1789-1800 | H/54: 2 envelopes of letters to Lady Hawke from Mrs ... | The Rosse Papers |
| 16192 | Birr Castle Archives | A-W | 1791-1800 | H/57: Letters to Lady Hawke from Miss Anne Gibbs, Hu... | The Rosse Papers |
| 12620 | Cork City and County Archives | Box 17: Papers of John Jenkins | 1800-1824 | Papers of John Jenkins, Attorney at Law and Under-Di... | Youghal Town Records |
| 13012 | Cork City and County Archives | | 1757-1800 | Boxes 1-6: Judicial Criminal Proceedings: documents ... | Youghal Town Records |
| 23836 | Cork City and County Archives | | 1800-1900 | Cemetery Records 1800s-1900s | Cork County Council Records - Miscellaneous |
| 23014 | Cork City and County Archives | U87/ | 1800-1822
1717 | 2: Register of Baptisms, 1717-99; baptisms and marri... | Cork Presbyterian Meeting House Records |
| 13049 | Dublin Diocesan Archives (RC) | P1/36/4 | 1800-1862 | Archdeacon John Hamilton (1800-1862) was the secreta... | Hamilton Papers |
| 2241 | Irish Theatre Archive | ITA/75 | 1800-1899
1900-1999 | Press cuttings, Queen's Theatre, Dublin, 19th to... | Press cuttings, Queen's Theatre, Dublin |
| 21718 | Kerry Diocesan Archives (RC) | S95 | 1800-1853 | Accounts Book XXI, 1800 - 1853. | Bishop Charles Sugrue, 1797-1825 |
| 21719 | Kerry Diocesan Archives (RC) | | 1800-1853 | 1800-1853:1 Account Book, Dr Egan and Dr Sugrue, reg... | Bishop Charles Sugrue, 1797-1825 |
| 21018 | King's Hospital School | 100-115 | 1792-1800 | 114 Monthly Accounts, 1792 -1800. | King's Hospital Records |
| 21576 | Monaghan County Museum | | 1793-1800 | Marron Collection: Copy documents, State Paper Offic... | |
| 3945 | National Archives of Ireland | Carton 620/49 | 1800 | 63 Memorial of [?] Dobbyn, St Mary's, New Ross, hus... | Rebellion Papers |
| 4774 | National Archives of Ireland | Carton 620/17/35-36 | 1799-1800 | Examination of Bridget Dolan of Carnew, 3 October 17... | Rebellion Papers |
| 4962 | National Archives of Ireland | 39/a-e | 1798
1800 | 1798 Rebellion Papers in the Quit Rent Office Collec... | Quit Rent Office |
| 4964 | National Archives of Ireland | | 1798
1800 | 1798 Rebellion Papers in the Quit Rent Office Collec... | Quit Rent Office |
| 4965 | National Archives of Ireland | 45/a-e | 1798
1800 | 1798 Rebellion Papers in the Quit Rent Office Collec... | Quit Rent Office |
| 8821 | National Archives of Ireland | Carton 620/9/98/7 | 1800 | Private Information: Annoymous letter to Lord Castle... | Rebellion Papers |
| 11509 | National Archives of Ireland | | 1773-1800 | House Expenses, month by month, 1773-1800. | Byrne Papers |
| 15464 | National Archives of Ireland | 999/44/2 | 1800-1899 | Portion of a counsel’s opinion possibly by Jon... | Small Private Accessions |
| 136 | National Library of Ireland | Ms18450 | 1800-1899
1960 | 'Family Patchwork' by Mrs Georgiana McGeogh Bond, a ... | |
| 945 | National Library of Ireland | Ms11109 | c1700-1800 | Rentals and other documents concerning the Grogan es... | Grogan Papers |
| 963 | National Library of Ireland | Ms11350 | 1800-1840 | Letters of General Sir F Trench to his parents, earl... | Domvile Papers |
| 975 | National Library of Ireland | Ms11429 | 1800-1899 | Miscellaneous documents relating to the Lloyd family... | |
| 1493 | National Library of Ireland | Ms1694 | c1800 | A volume of verse by Marie Ann Dawson, c1800. | |
| 1494 | National Library of Ireland | Mss1715-1717 | 1742-1800 | Typescript copies of letters to and from William Cop... | |
| 1524 | National Library of Ireland | Ms2262 | 1778-1800 | Collection includes an unsigned holograph letter fro... | |
| 1539 | National Library of Ireland | Ms2767 | 1800-1899 | Maps, valuation and rental documents relating to the... | |
| 1540 | National Library of Ireland | Ms2796 | 1800-1899 | Photocopy of a survey and maps of Ardnemullan estate... | |
| 1557 | National Library of Ireland | Ms3209 | 1786-1800 | Account book of Lady Erne's Armagh and Tyrone proper... | |
| 1697 | National Library of Ireland | Ms10255 | 1700-1799
1800-1899
1779 | Miscellaneous 18th and 19th century documents. These... | Townley Hall Papers |
| 2007 | National Library of Ireland | Ms7963 | 1800-1899 | Memoir of Frances Brown, the blind poetess, 1816 - ?... | |
| 2510 | National Library of Ireland | Ms10750 | 1788-c1800 | Promissory note and papers which include details of ... | F.S. Bourke Collection |
| 2531 | National Library of Ireland | Ms9561 | c1800 | Lady Florence Balfour's book of recipes and pres... | Townley Hall Papers |
| 2533 | National Library of Ireland | Mss1715-1719 | 1742-1800 | Typescript copies of letters to and from William Cop... | |
| 2554 | National Library of Ireland | Ms9245 | 1798-1800
1943 | Typescript of 'The sixth Parliament of George III, 1... | |
| 2669 | National Library of Ireland | Ms8149 | 1800-1899
1900-1999 | Collection of letters to Sarah Purser, including 13 ... | |
| 2884 | National Library of Ireland | Ms1552 | 1800 | Printed copy of an Act of Parliament (40 George III,... | |
| 2893 | National Library of Ireland | Ms8519 | 1800
1810 | Copies of documents relating to the Esmonde family, ... | Esmonde Papers |
| 2910 | National Library of Ireland | Ms8622 | 1800-1811 | Letters by Stephen W Howse to his father, mother, an... | |
| 2934 | National Library of Ireland | Ms8676 | 1800-c1839 | Documents relating to the case in Chancery of Mary W... | Whaley Papers |
| 2966 | National Library of Ireland | Ms8901 | 1791-1800
1855 | Rentals and other documents. These include rentals o... | |
| 3012 | National Library of Ireland | Ms9571 | 1795-1800 | Notes on charity distribution and other papers. The ... | Townley Hall Papers |
| 3445 | National Library of Ireland | Mss10259-10262 | 1685
1700-1799
1800-1899 | Rentals of Balfour (and other?) properties, County F... | Townley Hall Papers |
| 3461 | National Library of Ireland | Ms10377 | 1800-1849 | About 50 letters to Blayney T Balfour and his wife, ... | Townley Hall Papers |
| 3515 | National Library of Ireland | Mss11078-11079 | 1800-1813 | Ten letters from Mary E Masterson to Phillis Masters... | Grogan Papers |
| 3598 | National Library of Ireland | Ms12171 | 1796-1800 | Labourers' and Tenants' Ledger, estate of Thomas Plu... | Louth Papers |
| 3624 | National Library of Ireland | Mss12790-12804 | 1800-1829 | Accounts for rent of the Earl of Leitrim's estate in... | Leitrim Papers |
| 6921 | National Library of Ireland | Ms19088 | 1800-1805 | Personal marriage and baptismal register of the Revd... | |
| 8991 | National Library of Ireland | Ms13630(1) | 1800-1834 | Report on the state of the glove-making industry in ... | O'Connell Papers |
| 8992 | National Library of Ireland | Ms13630(10) | 1800-c1845 | Report of the workers in the tailoring trade in Dubl... | O'Connell Papers |
| 9308 | National Library of Ireland | Ms23463 | 1800-1801 | Domestic and Personal Account Book [of Charlotte Vis... | Doneraile Papers |
| 9539 | National Library of Ireland | Ms29775(1-8) | 1800-1900 | Family correspondence, 1800-1900. There are 8 folder... | Bruen of Oakpark (County Carlow) Papers |
| 10763 | National Library of Ireland | Ms20291 | 1781-1800 | Letters to Charles O'Hara the younger from Frances J... | O'Hara Papers |
| 10782 | National Library of Ireland | Ms20601 | c1699-1800 | Letters of Lady Arabella [Arbella] Denny mainly rela... | Rowan Papers |
| 11047 | National Library of Ireland | Ms18756 | 1797-1800 | Diary of Elizabeth Edgeworth, sister of Maria, Decem... | |
| 16678 | Presentation Sisters Congregational Archives | | 1800 | Book of house accounts from 1800 onwards to the late... | Presentation Convent, Kilkenny |
| 16679 | Presentation Sisters Congregational Archives | | 1800 | Correspondence between Kilkenny and other Presentati... | Presentation Convent, Kilkenny |
| 16701 | Presentation Sisters Congregational Archives | | 1769-1783
1800 | Correspondence, 4 items, 1769-c1800, includes photoc... | Presentation Sisters South West Province - South Presentation Community |
| 6608 | Public Record Office of Northern Ireland | D/1728 | c1800-c1849 | The bulk of this collection of c150 documents compri... | |
| 7550 | Public Record Office of Northern Ireland | D/957 | c.1800 | Commonplace book of Marion Leigh, Hilltown area, Cou... | |
| 8178 | Public Record Office of Northern Ireland | T/1994/1 | 1800-1940 | Copy of the genealogy of the Kidd family, Armagh, Co... | |
| 6987 | Public Record Office of Northern Ireland | D/2459 | 1800-1954 | 25 documents relating to Henry Campbell and Company ... | |
| 7140 | Public Record Office of Northern Ireland | D/2930 | c1800-1892 | The papers of the Young family, Belfast comprise of ... | |
| 7774 | Public Record Office of Northern Ireland | MIC/333/ | 1800-1897 | Microfilmed copies of passenger lists of vessels arr... | |
| 7876 | Public Record Office of Northern Ireland | T/1116 | 1800-1935 | Copy of a book of genealogical notes and trees on nu... | |
| 7962 | Public Record Office of Northern Ireland | T/1342/1-10 | 1800-1901 | Copies of minutes and accounts of a Presbyterian Poo... | |
| 7998 | Public Record Office of Northern Ireland | T/1454/ | c.1800-c.1900 | This collection of c.50 documents includes, for exam... | |
| 8020 | Public Record Office of Northern Ireland | T/1512 | 1650-1800 | A pedigree of the Sloane family, Killyleagh, County ... | |
| 8035 | Public Record Office of Northern Ireland | T/1570 | 1800-1958 | Genealogical notes relating to the following familie... | |
| 8041 | Public Record Office of Northern Ireland | T/1584 | 1783-1800 | 3 volumes of copies of marriage and death notices ta... | |
| 8047 | Public Record Office of Northern Ireland | T/1593 | 1600-1800 | Typescript history of the Faulkner family, Cookstown... | |
| 8048 | Public Record Office of Northern Ireland | T/1594 | 1600-1800 | Pedigree of the Barton family, Enniskillen, County F... | |
| 8087 | Public Record Office of Northern Ireland | T/1711 | c.1800 | Photostat typescript copies in book form, including ... | |
| 8101 | Public Record Office of Northern Ireland | T/1750 | 1800-c.1959 | Attested copy of a memorial and affidavit from the D... | |
| 8109 | Public Record Office of Northern Ireland | T/1824 | 1600-1800 | Pedigree of the Orr family, Ballyblack, County Down,... | |
| 8155 | Public Record Office of Northern Ireland | T/1944/1 | 1674-1800 | Brief genealogical notes on the Crockett family, Ten... | |
| 8222 | Public Record Office of Northern Ireland | T/2108/3 | 1700-1800 | Pedigree of the Charter/Chartres family, Curragh, Co... | |
| 8229 | Public Record Office of Northern Ireland | T/2129/7-8 | 1600-1800 | History of the Houston family, c.1600-c.1800. The da... | |
| 8388 | Public Record Office of Northern Ireland | T/2585/1 | 1800-1963 | Genealogical table of the McCrossan and McColgan fam... | |
| 21464 | Queen's University Belfast Special Collections and Archives | MS74 | 1800
1922 | MS 1/4 Holograph letter 4to. 7 pages. From John Wils... | QUB Miscellaneous Manuscripts |
| 22269 | RCSI Heritage Collections | Arch/7/A-B | 1800-1861 | Proceedings of the Governors of the House of Industr... | House of Industry & House of Industry Hospitals |
| 579 | Religious Society of Friends in Ireland Historical Library | YM/B8 | 1800-1825 | Women's Meeting: Epistles, 1800-1825. Volume conta... | Yearly Meetings |
| 820 | Religious Society of Friends in Ireland Historical Library | QM1/H6-9 | 1800-1855 | Schools and Education: QM1/H6 Proceedings of the Co... | Leinster Quarterly Meetings |
| 875 | Religious Society of Friends in Ireland Historical Library | Mss Box 11 | 1800
1876 | Notebook of Louisa Elizabeth Pim, 1876, containing s... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1059 | Religious Society of Friends in Ireland Historical Library | Mss Box 23/Case III Lower | 1800-1899 | Extensive list of leases of lands, indentures, power... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1120 | Religious Society of Friends in Ireland Historical Library | Mss Box 35 | 1800-1817 | Leadbeater/Shackleton Papers: Elizabeth Leadbeater's... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1121 | Religious Society of Friends in Ireland Historical Library | Mss Box 36 | 1776-1800 | 1 Collected verses of Mary Leadbeater, c1800. 2 ... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1286 | Religious Society of Friends in Ireland Historical Library | | 1800-1850 | Art: Sarah Deaves, born 1800, and her daughter Sally... | Museum Collection |
| 1336 | Religious Society of Friends in Ireland Historical Library | MMVII/F1 | 1768-1800 | Testimonies: Testimonies of Disownments and Certific... | Wicklow Monthly Meetings |
| 3535 | Religious Society of Friends in Ireland Historical Library | MM/XIIB1/Reel 16 | 1793-1800 | Women's Minutes, Lisburn Monthly Meeting, 12 Septemb... | |
| 11124 | Religious Society of Friends in Ireland Historical Library | MM/XVIIIM1/Reel 43 | 1741-1800 | Antrim Monthly Meeting: Testimonies of Disownments, ... | |
| 447 | Roscommon Local Studies and Archives | | 1740-1799
1800-1899
1900-1989 | There are a number of files containing material rela... | Miscellaneous |
| 2208 | Royal College of Physicians of Ireland | | 1800-1899 | Sir Dominic Corrigan, 1802-1880, President of the Co... | Sir Dominic Corrigan |
| 21982 | St Columb's Cathedral, Derry | | 1740-1800 | Vestry books of Saint Columb's Cathedral, Londonderr... | |
| 12117 | St Louis' Heritage Centre | 43LHAC/GB16-46LHAC/GB16 | 1859-1862
1800-1884 | Material relating to the founders of St Louis Order:... | |
| 1689 | Tipperary Studies | | 1760-1800
1823-1828
1844-1847
1853-1976
1977-1982 | Minutes of Library Committee Meetings: 1927-1932 193... | |
| 10215 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs6444 | 1800-1811 | Correspondence between the Chapman family and Sir Wa... | Groves Papers |
| 10252 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs10604a | 1800-1899 | Miscellaneous papers of the Female Friendly Union, n... | |
| 18757 | Trinity College Dublin, Manuscripts and Archives Department | TCD MS 11429 | 1800-1831 | The first poems are signed E.C.T. and one, being add... | Book of Poetry |
| 17275 | Ulster University Archive & Special Collections, Coleraine Campus | | 1800-1975 | Envelope marked 'Carrothers' correspondence&... | Norman Carrothers Papers |
| 1191 | Wexford County Archive | WXCA/P/ | 1800-1924 | 52 - Rental Ledger of Colcough Estate (Tintern), 185... | Wexford Estate Papers - Individual Rentals |