| 16804 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1811-1813 | Lismore Estate?Ledger accounts, 1811-1813, 1 volume. | Bolton Library Archive |
| 16815 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1811-1815
1824-1834 | Lismore Estate?Banteer Rent Book, 1824-1834 with loo... | Bolton Library Archive |
| 16863 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1811-1818 | Lismore Estate:Lord Lismore's Letter Book, 1811-... | Bolton Library Archive |
| 4221 | Church of Ireland Centre | Ms100 | 1811-1815 | Committee Minutes and Resolutions, 2 December 1811-1... | Records of the Society for Promoting the Education of the Poor of Ireland |
| 19496 | Cloyne Diocesan Archive (RC) | Box E | 1810-1811
1828 | 1792.07/1/1828 Letter from Miss E Courtenay, London... | Bishop Collins |
| 13045 | Cork City and County Archives | Box 15: spirit licences | 1796-1811 | Notices of intention to apply for or renew spirit li... | Youghal Town Records |
| 22982 | Cork City and County Archives | U296 | 1790-1807
1808-1811
1816-1826 | 3 account books:2 January 1790-24 December 1807, for... | Cooper Penrose Papers |
| 6261 | Cultural Heritage Services Library, Armagh | 289.6415 | 1811
1830 | Bound printed volume, Advises and rules agreed to by... | |
| 19921 | Erasmus Smith Schools Archives | | 1811-1921 | Minute Books of the Erasmus Smith Trust Standing Com... | Erasmus Smith Archives |
| 11816 | Kilkenny Local Studies Department | CR/H/4 | 1796-1811 | Notebook containing summaries of Deeds, 9 July 1796-... | |
| 21042 | King's Hospital School | 116-130 | 1810-1811 | 124 Account of receipts and payments, 1810 - 1811. | King's Hospital Records |
| 22889 | Methodist Historical Society of Ireland | | 1811 | 1 volume collection book for the erection of Waterfo... | |
| 2481 | National Library of Ireland | Ms10247 | 1811-c1865 | Recipes, menus, remedies, household notes, etc., mai... | Townley Hall Papers |
| 2738 | National Library of Ireland | Ms20878 | c1811 | Five letters to Revd. William Bruce relating to the ... | Bruce Papers |
| 2910 | National Library of Ireland | Ms8622 | 1800-1811 | Letters by Stephen W Howse to his father, mother, an... | |
| 3626 | National Library of Ireland | Ms12808 | 1811-1813 | Cash book detailing domestic expenditures of H T Cle... | Clements Papers |
| 3732 | National Library of Ireland | Ms12979 | 1806-1811 | Journal of payments by and to Sir Joshua Paul relati... | |
| 9550 | National Library of Ireland | Ms29770(47) | 1811 | Marriage settlement of Revd. Arthur Vesey and Miss S... | Doyne Papers |
| 10742 | National Library of Ireland | Ms19815 | 1811 | Manuscript collection of Catholic prayers with colou... | |
| 5452 | Newtown School, Waterford | BB/5-9 | 1811-1890 | Proceedings of the General Meeting of the Library Co... | |
| 18993 | Offaly Archives | OHS77/8/ | 1811-1902 | Papers of Helen Lamb:1 - Correspondence of the Cronh... | Woodfield Papers |
| 7107 | Public Record Office of Northern Ireland | D/2794 | 1811-1932 | c600 documents relating to the Montgomery family, Po... | |
| 7141 | Public Record Office of Northern Ireland | D/2935 | 1811-1872 | Recipe book of Charlotte Echlin of Echlinville, also... | |
| 7274 | Public Record Office of Northern Ireland | D/3560 | 1811-1867 | Album entitled 'Glenarm Castle and its vicinity&... | |
| 8083 | Public Record Office of Northern Ireland | T/1701/ | 1811-1857 | Photostat copies of family papers and letters relati... | |
| 8114 | Public Record Office of Northern Ireland | T/1834/1-2/ | 1810-1811 | T/1834/1 Copy of a journal relating the English mili... | |
| 8117 | Public Record Office of Northern Ireland | T/1839 | 1743-1811 | Volume of c.100 copy letters which include, for exam... | |
| 8137 | Public Record Office of Northern Ireland | T/1883 | 1811-1847 | This collection of 80 documents is comprised of copi... | |
| 8275 | Public Record Office of Northern Ireland | T/2264/ | 1811-1829 | Papers of Magherahamley Meeting House, County Down. ... | |
| 8305 | Public Record Office of Northern Ireland | T/2363/1-2 | 1708-1811
1690-1917 | Typescript notes on the Cochrane family, Edenmore, C... | |
| 8514 | Public Record Office of Northern Ireland | T/2928 | 1811-1824 | Copies of 6 letters of the Wightman family, Florence... | |
| 8576 | Public Record Office of Northern Ireland | T/3647 | 1811 | Copy of a letter from Mrs Holmes, Tullygoney, County... | |
| 8596 | Public Record Office of Northern Ireland | T/426 | 1810-1811 | This collection includes, for example: Copy of a let... | Myles Papers |
| 8718 | Public Record Office of Northern Ireland | T/922/1 | 1811-1905 | Copies of entries relating to the Montgomery family,... | |
| 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 |
| 3555 | Religious Society of Friends in Ireland Historical Library | MM/XIIG1/Reel 21 | 1811-1861 | Record of Sufferings, Lisburn Monthly Meeting, 1811-... | |
| 3569 | Religious Society of Friends in Ireland Historical Library | MM/XIIIM3/Reel 29B | 1715-1811 | Marriage Certificate Book, Lurgan Monthly Meeting, 1... | |
| 21504 | Sligo Archives Service | F.C./D.2/16 | 1811 | Deed betweeen Elizabeth Cuffe and James Walker relat... | |
| 6468 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs7083/10 | 1811 | Letter from Maria Edgeworth, Edgeworthstown, to Mrs ... | |
| 10215 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs6444 | 1800-1811 | Correspondence between the Chapman family and Sir Wa... | Groves Papers |
| 10387 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs7619/1-20 | 1811-1820 | Rentals relating to the estate of Sir Robert Gore Bo... | Arran Papers |
| 11226 | Trinity College Dublin, Manuscripts and Archives Department | P 33/8/1-11 | 1805-1811 | Executorship Papers of Thomas Stopford, Bishop of Co... | Courtown Papers |
| 19334 | Westmeath County Archives Department | | 1811 | 245 Thomas Gerrard Esq. to the Honourable Martha Wi... | Howard Bury Papers |