| 13054 | Armagh County Museum | 1936/83 | 1805 | Assize calendar, County Down, Lent Assizes 1805, div... | |
| 16166 | Birr Castle Archives | A-W | 1805-1806 | D/10/1-14: Letters between William Parsons and Lady ... | The Rosse Papers |
| 16196 | Birr Castle Archives | A-W | 1805 | H/65: Includes a letter from Frances Harvey Hawke to... | The Rosse Papers |
| 16845 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1805-1899 | Vestry Minute Books, Ballintemple: 1805-1870 1870-18... | Bolton Library Archive |
| 16846 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1805-1844 | Ballintemple Register of Marriages, Baptisms and Bur... | Bolton Library Archive |
| 5283 | Cloyne Diocesan Archive (RC) | Box A | 1794-1805 | 1791.00/2 Marriage Exhortation, given at a marriage... | Bishop Copinger |
| 1401 | Cork Public Museum | AQNO1963:7-8 | 1805-1807 | 2 farm account books, 1805-1807. | |
| 21908 | Galway Diocesan Archives (RC) | | 1805-1812 | Box 8 Warden Valentine Bodkin papers 1805-1812. | |
| 21916 | Galway Diocesan Archives (RC) | | 1805-1822 | Box 16 Nicholas Archdeacon, Bishop of Kilmacduagh pa... | |
| 13052 | Kilmainham Gaol Museum | 3BK-1J53-1 | 1805 | Papers presented to the House of Commons respecting ... | Catholic Emancipation |
| 13053 | Kilmainham Gaol Museum | 3BK-1J53-2 | 1805 | Papers presented to the House of Commons respecting ... | Catholic Emancipation |
| 21086 | King's Hospital School | 161-179 | 1805 | 162 Subscriptions half-yearly by relatives, August 1... | King's Hospital Records |
| 11508 | National Archives of Ireland | | 1805 | Includes, among other items, draft will of E[linor] ... | Byrne Papers |
| 11532 | National Archives of Ireland | | 1805 | Lease for 29 years by Mrs Margaret Rossiter, Rosemou... | Byrne Papers |
| 11533 | National Archives of Ireland | | 1805 | Lease for 29 years by Mrs Margaret Rossiter, Rosemou... | Byrne Papers |
| 908 | National Library of Ireland | Ms5615 | 1805-1813 | An album of poems and sketches for Mrs Harriet Parry... | |
| 909 | National Library of Ireland | Ms5634 | 1805, 1821-1847 | Minutes of the management committee of the Collon, C... | |
| 1544 | National Library of Ireland | Ms2664 | 1790-1805 | Minutes of meetings of the governors of St Mary's Ch... | |
| 1868 | National Library of Ireland | Mss11,062-Ms11,067 | 1623-1805 | Ms11,062 21 items, 1623-1805. Includes petition of R... | Ormonde Papers |
| 1931 | National Library of Ireland | Ms4487 | 1702-1805 | The collection includes a copy of a Protestant paris... | Canon Leslie Collection |
| 1939 | National Library of Ireland | Ms4108 | 1805, 1814 | Abstracts of male and female wills printed in the 'R... | |
| 1957 | National Library of Ireland | Ms4847 | 1746
1798
1805
1859 | Copies of Mrs Caroline Hamilton's family reminiscenc... | Wicklow Papers |
| 2462 | National Library of Ireland | Ms8561 | 1805-1900 | Correspondence of members of the Browne family of Fa... | Browne Papers |
| 2518 | National Library of Ireland | Ms4806 | 1805-1806 | Commonplace Book of [? Lady Eleanor Butler of Llango... | Wicklow Papers |
| 2610 | National Library of Ireland | Mss611-614 | 1759-1805 | Letters of Lady Louisa Conolly (nee Lennox) to her s... | |
| 2310 | National Library of Ireland | Ms4809 | 1805-1806 | Commonplace book of Caroline Hamilton of Hamwood, Co... | Wicklow Papers |
| 3599 | National Library of Ireland | Ms12173 | c.1790-1805 | Miscellaneous documents relating to Lord Louth's est... | Louth Papers |
| 3601 | National Library of Ireland | Ms12187 | 1805 | A copy of Mary Tighe's poem, `Psyche or the Legend o... | |
| 6921 | National Library of Ireland | Ms19088 | 1800-1805 | Personal marriage and baptismal register of the Revd... | |
| 9172 | National Library of Ireland | Ms15144 | 1805-1862 | Letters to William Kemmis, Crown Solicitor, 1805-186... | Kemmis Papers |
| 9549 | National Library of Ireland | Ms29770(42) | 1805 | Marriage settlement of Robert Doyne (Wells) and Mrs ... | Doyne Papers |
| 10766 | National Library of Ireland | Ms20310 | c1805-1844 | Letters to Charles King O'Hara in his capacity of ma... | O'Hara Papers |
| 10771 | National Library of Ireland | Ms20366 | c1799-1805 | Thirty letters to Margaret O'Hara from Anne Venables... | O'Hara Papers |
| 8021 | Public Record Office of Northern Ireland | T/1516/1 | 1805 | Copy of a map, including a survey of the manor of Gl... | |
| 8317 | Public Record Office of Northern Ireland | T/2400/1 | 1805 | Copy of 170 page booklet of medicinal recipes compil... | |
| 6379 | Public Record Office of Northern Ireland | T/1792/1 | 1805 | Copy of a letter containing family news from Mary Ir... | |
| 6760 | Public Record Office of Northern Ireland | D/2138 | 1805-1962 | This collection of miscellaneous estate papers inclu... | |
| 6793 | Public Record Office of Northern Ireland | D/2269 | c.1805-1959 | This collection of c.300 documents includes, for exa... | |
| 7272 | Public Record Office of Northern Ireland | D/3549 | c.1805-1948 | This collection includes, for example: Letters to Mr... | Wardenstown Papers |
| 7972 | Public Record Office of Northern Ireland | T/1373/5-6 | c.1798-1805 | Copy of a letter from Andrew Bryson, New York, to Ne... | |
| 8008 | Public Record Office of Northern Ireland | T/1475 | 1805-1884 | This collection of 47 documents includes, for exampl... | |
| 8023 | Public Record Office of Northern Ireland | T/1539/1-3 | 1805-1879 | 3rd Rathfryland Presbyterian Church, County Down: Vo... | |
| 8026 | Public Record Office of Northern Ireland | T/1545/2 | 1805-1948 | Pedigree of the Wray family, Quilley, County Londond... | |
| 8054 | Public Record Office of Northern Ireland | T/1614 | 1781-1805 | Copies of the domestic account books of the Magowan ... | |
| 8165 | Public Record Office of Northern Ireland | T/1969 | 1805-1856 | This collection includes, for example: Copies of 4 l... | |
| 8380 | Public Record Office of Northern Ireland | T/2568/1 | 1805-1880 | A copy of a diary written by Mary Hutton in 1880. ... | |
| 8425 | Public Record Office of Northern Ireland | T/2655 | 1805-1967 | T/2655/1/1A-2 Pedigree and notes on the Jackson fam... | |
| 8467 | Public Record Office of Northern Ireland | T/2757 | 1805-1815 | Copies of correspondence between members of the Crai... | |
| 507 | Religious Society of Friends in Ireland Historical Library | Portfolio 13 | 1805 | 11 Sarah Grubb, Anne Mills to Mary Pim, 1805. 12 ... | Handlists/Portfolio |
| 3881 | Religious Society of Friends in Ireland Historical Library | Mss Box 57 | 1675-1805 | Mss Box 57: Notebook 2 containing letter from Job Sc... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 5331 | Religious Society of Friends in Ireland Historical Library | MMIX/J1 | 1805 | Accounts: Building of Meeting House, Subscription li... | Limerick Monthly Meeting |
| 10157 | Trinity College Dublin, Manuscripts and Archives Department | TCDMss7885/1-25 | 1805-1867 | Morris Papers, comprising mostly of letters to Miss ... | Erskine Childers Papers |
| 10260 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs3518 | 1805-1825 | Letters to Elizabeth Leadbeater, mainly from Betsy S... | Shackleton Family Papers |
| 10268 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs5096 | 1768-1794
1805
1819 | Material relating to Anne O'Brien, died 1819, wife o... | |
| 10429 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs10047/23 | 1805-1829 | Correspondence of Helena Perceval, later Graves, wit... | Graves 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 |