| 19125 | Armagh Robinson Library | Volume 8 | 1826 | A list of annuities of £416 paid to 16 widows ... | Primate J.G. Beresford Papers |
| 19126 | Armagh Robinson Library | Volume 8 | 1826-1827 | A list of all those christened, married or buried at... | Primate J.G. Beresford Papers |
| 16165 | Birr Castle Archives | A-W | 1802-1826 | D/8/1-22 Correspondence between William Parsons and ... | The Rosse Papers |
| 16813 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1826-1837 | Lismore Estate:Account Book, 1826-1837, Clogheen, re... | Bolton Library Archive |
| 4224 | Church of Ireland Centre | Ms103 | 1822-1826 | Committee Minutes and Resolutions, 14 December 1822-... | Records of the Society for Promoting the Education of the Poor of Ireland |
| 4225 | Church of Ireland Centre | Ms104 | 1826-1829 | Committee Minutes and Resolutions, 22 April 1826-11 ... | Records of the Society for Promoting the Education of the Poor of Ireland |
| 4244 | Church of Ireland Centre | Ms147 | 1826-1829 | Signature Book, 2 October 1826-28 February 1829. | Records of the Society for Promoting the Education of the Poor of Ireland |
| 4248 | Church of Ireland Centre | Ms319-323 | 1826-1827 | Payments made to teachers under the Cork Committee o... | Records of the Society for Promoting the Education of the Poor of Ireland |
| 4298 | Church of Ireland Centre | Box No24 | 1826-1834 | Papers regarding Publication of Cheap Books II:Seria... | Records of the Society for Promoting the Education of the Poor of Ireland |
| 19494 | Cloyne Diocesan Archive (RC) | Box E | 1826 | 1792.05/8/1826 Draft of sworn statement regarding D... | Bishop Collins |
| 19495 | Cloyne Diocesan Archive (RC) | Box E | 1826 | 1792.05/9/1826 Sworn 'information' regarding... | Bishop Collins |
| 23804 | Cork City and County Archives | U183 | 1826-1870 | Vestry Book 1826-1870. | |
| 23808 | Cork City and County Archives | U288 | 1826 | C. Eustace (?), Dieppe, to Mrs Johnson, Macroom, 30 ... | |
| 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 |
| 16495 | Delany Archive | Box Bp.03 File JKL.1826/ | 1826 | 19: 12 April 1826 Doyle to Sr Clare, Convent, Carlow... | Papers of Dr James Doyle, Bishop of Kildare & Leighlin |
| 23848 | Delany Archive | Box Bp.03 File JKL.1826/ | 1826 | 26: 5 May 1826 Bishop B.J. (Flaget) Bardstown, to Do... | Papers of Dr James Doyle, Bishop of Kildare & Leighlin |
| 19898 | Erasmus Smith Schools Archives | | 1826-1935 | Letters regarding the establishment and maintenance ... | Erasmus Smith Archives |
| 1 | Irish Dominican Congregation Archives | A10 | 1797-1826 | Channel Row: Account Book, number 8, 1797 - 1826, in... | Dominican Archives, Cabra |
| 22146 | Irish Jesuit Archives | J27/ | 1826-1903 | 75 22 January 1826 -12 August 1903. A file relating ... | Papers of Fr Matthew Russell, SJ (1834 - 1912) |
| 22178 | Irish Jesuit Archives | N8/ | 1826 | 9 Letter from Dr Charles Russell, Maynooth College, ... | Papers of Revd Dr Charles William Russell (1812-1880) |
| 11699 | Kilkenny Local Studies Department | CR/D/8 | 1775-1826 | Kilkenny Corporation Minute Book, 9 September 1775-3... | Kilkenny Corporation |
| 11700 | Kilkenny Local Studies Department | CR/D/9 | 1826-1843 | Kilkenny Corporation, Minute Book, 16 May 1826-23 Oc... | Kilkenny Corporation |
| 11814 | Kilkenny Local Studies Department | CR/G/1-4 | 1826-1833 | Tithe Applotment Books:1. Parish of St Mary's, N... | |
| 20155 | Meath Local Studies and Family History Department | Box C/ | 1826 | 13 Lease of land at Drakestown, Hugh Reilly by Arthu... | Mountainstown Documents |
| 20163 | Meath Local Studies and Family History Department | Box C/ | 1826 | 18 Lease of land in Drakestown, 1826. | Mountainstown Documents |
| 4090 | National Archives of Ireland | | 1826-1828 | Private Index, 1826-1828, includes: Duane, Mary, con... | Chief Secretary's Office/Registered Papers |
| 4093 | National Archives of Ireland | OP926/3/Series 1 | 1826 | Volume II page 608: Dalton, Jane, widow, memorial a... | Official Papers |
| 11436 | National Archives of Ireland | MFCI/5 | 1745-1826 | Castletown Arra, Diocese Killaloe, Vestry Book, late... | |
| 13088 | National Archives of Ireland | PPC2796 | 1826 | Petition of Elizabeth Harris, widow of a Church of I... | Prisoners' Petitions and Cases, 1778-1836 |
| 15538 | National Archives of Ireland | 999/149/19 | 1826 | Settlement on the marriage of John Carroll, Cahir, C... | Small Private Accessions |
| 166 | National Library of Ireland | Ms18607 | 1806-1826
1816 | Nine autograph letters, several incomplete, from Jul... | Farnham Papers |
| 174 | National Library of Ireland | Ms18753 | 1826-1838 | Current expenses account books of Maria Edgeworth, 1... | |
| 1969 | National Library of Ireland | Ms4957 | 1826-1831 | Daily report book of Carnew School on the estate of ... | |
| 2445 | National Library of Ireland | Mss9292-9346 | 1769-1826 | Diaries of Mary Leadbeater, nee Shackleton, of Bally... | |
| 2215 | National Library of Ireland | Ms10171 | 1826
1832
1843
1861-1862 | Papers and letters of the Ussher family of Cappagh, ... | Ussher Papers |
| 3002 | National Library of Ireland | Mss9429-9448 | 1826-1846 | Rentals and accounts of the Gascoigne estate, County... | Gascoigne Papers |
| 3009 | National Library of Ireland | Mss9480-9481 | 1826-1833 | Rentals of Cormackstown and Clonmore, County Tippera... | Brown of Clonboy Papers |
| 3030 | National Library of Ireland | Ms9746 | 1825-1826 | Accounts of Lady Henry Moore as an administrator of ... | Drogheda Papers |
| 3459 | National Library of Ireland | Ms10371 | 1804-1826 | 19 letters to Letitia Balfour, 1825-1826 and 8 lette... | Townley Hall Papers |
| 3724 | National Library of Ireland | Ms12993 | 1803-1826 | Records of expenditures by William Gun Paul as execu... | |
| 9088 | National Library of Ireland | Mss14289-14290 | 1826-1894 | Rent Ledger and Farm Accounts, Quinlan estate, near ... | |
| 9150 | National Library of Ireland | Ms14866 | 1826-1827 | Personal Account Book of Mrs Lewis Johnston and her ... | Inchiquin Papers |
| 9232 | National Library of Ireland | Ms15514 | 1826 | Two autographed letters of Maria Edgeworth in French... | |
| 9256 | National Library of Ireland | Ms15719 | 1823
1826
1833 | Four autographed letters of Mrs Felicia Hemans to: R... | |
| 9500 | National Library of Ireland | Ms26744 | 1826 | Correspondence of Maria Edgeworth and Thomas Henry L... | |
| 9585 | National Library of Ireland | Ms29791(1-17) | 1826-1842 | Rentals, Kilkenny, Tipperary, Waterford and Carlow e... | Bessborough Papers |
| 9633 | National Library of Ireland | Ms27392 | 1826 | Letters from Mrs C Cassin to Thomas Kelly relating t... | O'Bryne Papers |
| 9634 | National Library of Ireland | Ms27394 | 1826-1827 | Letters relating to business and social matters from... | O'Bryne Papers |
| 9680 | National Library of Ireland | Ms29808(2-3) | 1826-1827 | Rent Rolls of the estate of F A Prittie, May-Novemb... | Dunalley Papers |
| 9687 | National Library of Ireland | Ms27233 | 1823-1826 | Nine letters from Helena Bellew to her husband Micha... | Bellew Papers |
| 9688 | National Library of Ireland | Ms27237 | c1826-1827 | Eight letters from Olivia Bellew to her son, Michael... | Bellew Papers |
| 9689 | National Library of Ireland | Ms27236 | 1826-1831 | Letters to her husband Michael Dillon Bellew from Ol... | Bellew Papers |
| 9692 | National Library of Ireland | Ms31919 | 1776-1826 | Rent accounts, arrears' lists etc., mostly concernin... | Bellew Papers |
| 10920 | National Library of Ireland | Ms21923 | 1826 | Papers in the case of Jane McBride versus Dawson Chu... | |
| 11008 | National Library of Ireland | Ms18607 | 1806-1826 | Nine autograph letters, some incomplete, from Julian... | Farnham Papers |
| 11044 | National Library of Ireland | Ms18753 | 1826-1838 | Current Expenses Account Books of Maria Edgeworth, 1... | |
| 16533 | Presentation Sisters Congregational Archives | DON1/9 | 1826 | Letter from George Gould, Lisbon, to Mother M. Josep... | Presentation Sisters South West Province - St Joseph's Convent, Doneraile |
| 16534 | Presentation Sisters Congregational Archives | DON1/8 | 1826 | Letter from Miss Angelina Gould, Messrs Gould Broth... | Presentation Sisters South West Province - St Joseph's Convent, Doneraile |
| 16536 | Presentation Sisters Congregational Archives | DON1/10 | 1826 | Letter from Angelina Gould, Lisbon, to Mother Mary J... | Presentation Sisters South West Province - St Joseph's Convent, Doneraile |
| 6384 | Public Record Office of Northern Ireland | T/1799 | 1826-1960 | T/1799/1-3 Copies of 3 letters from S Dunlop, Hillh... | |
| 7016 | Public Record Office of Northern Ireland | D/2535/1 | 1826-1849 | Manuscript notebook containing entries for baptisms ... | |
| 7903 | Public Record Office of Northern Ireland | T/1182/1 | 1801-1826 | Copy of the Vestry Book, Derrykeighan parish, County... | |
| 6682 | Public Record Office of Northern Ireland | D/1901/5 | 1826 | Miscellaneous correspondence relating to Midleton es... | Midleton Estate Papers |
| 7133 | Public Record Office of Northern Ireland | D/2892 | 1826-1871 | c70 documents relating to J and J Cooke, shipping ag... | J. and J. Cooke Papers |
| 7266 | Public Record Office of Northern Ireland | D/3539/1-2 | 1826-1840 | Household Account Book, 1826-1830 and Recipe Book of... | Thomson of Jennymount Papers |
| 7505 | Public Record Office of Northern Ireland | D/562/ | 1665-1826 | D/562/1-38 Correspondence of Massereene family, incl... | Foster-Massereene Papers |
| 7754 | Public Record Office of Northern Ireland | MIC/1E/ | 1826-1980 | Maguiresbridge Methodist Church, County Fermanagh: M... | Methodist Church Records |
| 7921 | Public Record Office of Northern Ireland | T/1226/1 | 1650-1826 | 2 paper pedigrees of the Fisher family of Scotland a... | |
| 8015 | Public Record Office of Northern Ireland | T/1496/1-7 | 1826-1887 | This collection of 7 documents includes genealogical... | |
| 8577 | Public Record Office of Northern Ireland | T/3650 | 1826-1847 | Copies of letters from emancipated convicts, New Sou... | |
| 2274 | RCSI Heritage Collections | LO.An/3/11 | 1826-1854 | Joseph Smyly's Notebook begins with commonplace ... | Joseph Smyly Notebook |
| 1122 | Religious Society of Friends in Ireland Historical Library | Mss Box 38 | 1758-1826 | Journal 1769-1826 by Mary Leadbeater, 1758 -1826. Ty... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1124 | Religious Society of Friends in Ireland Historical Library | Mss Box 42 | 1791-1826 | Extracts from Mary Leadbeater Journal, edited and ar... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1439 | Religious Society of Friends in Ireland Historical Library | Portfolio 36G | 1826-1841 | Bateman-Hughes Correspondence, 1826-1841: 9 Agreeme... | Handlists/Portfolio |
| 3899 | Religious Society of Friends in Ireland Historical Library | Pamphlet Box 27 | 1826 | 93 Letter regarding Henrietta Williams Fund and Ext... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 5335 | Religious Society of Friends in Ireland Historical Library | MMIX/R1 | 1826-1842 | History and Library: Library Committee Minutes, 1826... | Limerick Monthly Meeting |
| 22393 | Royal College of Physicians of Ireland | | 1825-1826 | Letters and Reports and Other Documents relating to ... | Kings and Queens College of Physicians |
| 13089 | Tipperary Museum of Hidden History | AQNO1995.427 | 1826 | Summons, rent arrears, Matthew and Catherine Acheson... | |
| 13090 | Tipperary Museum of Hidden History | AQNO1995.428 | 1826 | Eviction notice, Matthew and Catherine Acheson, Clog... | |
| 6881 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs7321/1-26 | 1772-1826 | Rentals and Accounts of a County Leitrim estate, 177... | Clements Papers |
| 10239 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs7247 | 1802-1826 | Letters between Mrs Jane O'Beirne and her husband, R... | |
| 10424 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs10047/6 | 1736-1826 | Miscellaneous correspondence of members of the Perce... | Graves Papers |
| 10487 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs2318/2-3 | 1826-1843 | Letters from Joseph J Fitzpatrick, 1826-1843, to: Hi... | |
| 11157 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs50971/21-5 | 1826 | Lists of tenants' holdings on various estates, 1826. | O'Brien Family |
| 11228 | Trinity College Dublin, Manuscripts and Archives Department | P 33/10/1-22 | 1826-1828 | Correspondence relating to the first marriage settle... | Courtown Papers |
| 11248 | Trinity College Dublin, Manuscripts and Archives Department | P33/14/61 | 1826 | County Wexford Election Material: Mrs Anne Phayre, S... | Courtown Papers |
| 11249 | Trinity College Dublin, Manuscripts and Archives Department | P33/14/102 | 1826 | County Wexford Election Material: Miss Percivall to ... | Courtown Papers |
| 11250 | Trinity College Dublin, Manuscripts and Archives Department | P33/14/108 | 1826 | County Wexford Election Material: [Mrs] B Droffen to... | Courtown Papers |
| 11251 | Trinity College Dublin, Manuscripts and Archives Department | P33/14/112 | 1826 | County Wexford Election Material: Mrs Frances Jessop... | Courtown Papers |
| 11252 | Trinity College Dublin, Manuscripts and Archives Department | P33/14/115 | 1826 | County Wexford Election Material: Mrs [? J] E Le Hun... | Courtown Papers |
| 5600 | UCD Archives | TU4 | 1826-1908 | Rules and Regulations, Minute Books, Account Book, 1... | Waterford Bakers Union |