| 13144 | Armagh County Museum | 1956/61 | 1838
1851 | Memoranda books, medical, formerly belonged to Surge... | |
| 13854 | Armagh County Museum | 1965/126 | c1850 | Valentine, c.1850. | |
| 19143 | Armagh Robinson Library | Volume 1850-1859 | 1851 | An extract from the Armagh Guardian regarding t... | Dean Rennison Papers |
| 8765 | Ballymoney Library | U/A-BMO-BNA929.2LES | 1851 | Bound typescript volume of the history of the Leslie... | |
| 17009 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/1/1850 Letter, enclosure, Revd. M Sheehan, ... | Bishop W. Keane Papers |
| 17010 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/2/1850 Handwritten extracts from A Gould's ... | Bishop W. Keane Papers |
| 17011 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/3/1850 Letter, Revd. M Sheehan, Youghal to ... | Bishop W. Keane Papers |
| 17012 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/4/1850 Letter, Revd. M O'Brien, Mitchelstow... | Bishop W. Keane Papers |
| 17013 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/5/1850 Letter. Revd. M O'Brien, Mitchelstow... | Bishop W. Keane Papers |
| 17014 | Cloyne Diocesan Archive (RC) | Box D | 1796
1850 | 1796.05/6/1850 Letter, Revd T. Lee, Macroom, to Revd... | Bishop W. Keane Papers |
| 17016 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1796.00/6/1851 Photocopy of newspaper cutting from t... | Bishop W. Keane Papers |
| 17021 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1796.00/10/1851 From 'The Nation' 'The t... | Bishop W. Keane Papers |
| 17036 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.06/5/1851 14 November 1851. Letter from Angelin... | Timothy Murphy Papers |
| 17015 | Cloyne Diocesan Archive (RC) | Box D | 1850 | 1796.05/7/1850 Letter, Revd M. O'Brien, Mitchels... | Bishop W. Keane Papers |
| 17020 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1796.04/9/1851 Letter, Bishop M Slattery to Bishop ... | Bishop W. Keane Papers |
| 17029 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.06/1/1850 Letter Angelina Gould Youghal to Rev.... | Timothy Murphy Papers |
| 17030 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.07/16/1850 Letter from a parishioner of Mr Davi... | Timothy Murphy Papers |
| 17031 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.05/60/1850 Letter from the Rev. O'Hea, Rosscarb... | Timothy Murphy Papers |
| 17032 | Cloyne Diocesan Archive (RC) | Box B | 1850 | 1795.03/2/1850 Letter from Bishop Murphy, Adelaide t... | Timothy Murphy Papers |
| 17108 | Cloyne Diocesan Archive (RC) | Box J | 1850 | 1796.06/56/1858 Note `Foundation of the Convent of ... | Bishop W. Keane Papers |
| 17033 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.05/2/1851 Long letter from Rev. M. Sheehan, P.P... | Timothy Murphy Papers |
| 17034 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.06/2/1851 Letter from Sr M. Teresa Hogan, Charl... | Timothy Murphy Papers |
| 17035 | Cloyne Diocesan Archive (RC) | Box C | 1851 | 1795.04/7/1851 Letter from the Secretaries Education... | Timothy Murphy Papers |
| 17037 | Cloyne Diocesan Archive (RC) | Box D | 1851 | 1795.06/1/1852 Note and expenditure. M H Convent to ... | Timothy Murphy Papers |
| 23220 | Cork City and County Archives | U15B/ | 1851 | P/C 34 Katherine Bullen, Sunday's Well Road to H... | Thomas Hewitt Papers |
| 23221 | Cork City and County Archives | U15B/ | 1850 | P/C 61 L. Dubos, Brentford Butts, Seagrave Place, Bo... | Thomas Hewitt Papers |
| 23224 | Cork City and County Archives | U15B/ | 1851 | P/C 94 6/6/1851 Dr Charles Hewitt (Sydney Place, Cor... | Thomas Hewitt Papers |
| 21725 | Kerry Diocesan Archives (RC) | E59 | 1850 | Cholera in Cahirciveen, Mother Joseph, 1850. | Bishop Cornelius Egan, 1825 - 1856 |
| 21727 | Kerry Diocesan Archives (RC) | E62 | 1850 | Mother Joseph, 1850. | Bishop Cornelius Egan, 1825 - 1856 |
| 21896 | Kerry Local Studies and Archives Department | | 1793
1807
1817
1851 | Deeds, County Cork estate: No 192 12 August 1851. Co... | Listowel Papers |
| 20994 | King's Hospital School | 65-82 | 1850 | 78 Chadwicks Noddstown, 1850. | King's Hospital Records |
| 13143 | Limerick Museum | AQNO (0000.1764) | 1851 | Newspaper page: 'Illustrated London News', 6 Septemb... | |
| 14130 | Louth County Archives | | 1851 | Rental and account of the estate of Philip Doyne, Es... | |
| 14132 | Louth County Archives | | 1851 | Rental and account of the estate of Sir Frederick G.... | |
| 20620 | Meath Local Studies and Family History Department | Box E/ | 1851 | 8 Lease of land at Kilkriffin by Sir Raeph Howard to... | Mountainstown Documents |
| 21515 | Monaghan County Museum | | 1850 | K1-3 Photocopy letter and envelope. E.I. Foster to M... | Moorehead Letters |
| 21516 | Monaghan County Museum | | 1850 | L1-2 Photocopy letter and envelope. Unsigned to Mart... | Moorehead Letters |
| 21517 | Monaghan County Museum | | 1850 | M1-3 Photocopy letter and envelope. E.I. Foster to M... | Moorehead Letters |
| 21518 | Monaghan County Museum | | 1850 | N1-3 Photocopy letter and envelope. E.I. Foster to M... | Moorehead Letters |
| 21519 | Monaghan County Museum | | 1851 | O1-5 Photocopy 3 letters and 1 envelope includes let... | Moorehead Letters |
| 21520 | Monaghan County Museum | | 1851 | 03-4 Mother to Martha, undated. Family news. Letter ... | Moorehead Letters |
| 21521 | Monaghan County Museum | | 1851 | P1-4 Two photocopied letters from her sister, family... | Moorehead Letters |
| 21522 | Monaghan County Museum | | 1851 | Q1-3 Photocopy letter and envelope. 27 January 1851.... | Moorehead Letters |
| 21523 | Monaghan County Museum | | 1851 | R1-3 Photocopied letters and envelope 22 February 18... | Moorehead Letters |
| 21527 | Monaghan County Museum | | 1851 | U1-2 Photocopied letter and envelope. Thomas Moorhea... | Moorehead Letters |
| 21528 | Monaghan County Museum | | 1851 | V1-2 Photocopied letter and envelope, 12 December 18... | Moorehead Letters |
| 21589 | Monaghan County Museum | | 1851 | 1988 102 a-b2 b1-2 letter dated 2 January 1851 signe... | Moorehead Letters |
| 21590 | Monaghan County Museum | | 1850 | 1988 103a-b3 letter dated 12 /Feb/ 1850 and signed M... | Moorehead Letters |
| 3930 | National Archives of Ireland | | 1850 | Maps and Plans: Hospital Etching of the Chapel Ceili... | Royal Hospital Kilmainham |
| 15328 | National Archives of Ireland | 99/56/5/6 | 1850 | Carhampton Papers. Portarlington and members of the ... | Family and estate records. 1611-1948 |
| 15499 | National Archives of Ireland | 999/113/4 | 1850 | Copy surrender of lease for remainder of 300 years b... | Small Private Accessions |
| 15562 | National Archives of Ireland | 999/177 | 1851 | Photocopy of certified coy of portions of the census... | Small Private Accessions |
| 23991 | National Archives of Ireland | CIF L3/1850 | 1850 | William Lavery assault on his wife. It was noted tha... | Criminal Index Files |
| 2363 | National Library of Ireland | Ms12932 | c1850 | Susanna Barclay, medical receipts. Indexed book of r... | |
| 2498 | National Library of Ireland | Ms13400 | c1850 | Documents, mainly letters to Lord and Lady Monteagle... | Monteagle Papers |
| 2749 | National Library of Ireland | Ms20954 | 1851 | Nine letters to John D'Alton from his daughter Eliza... | D'Alton Papers |
| 2985 | National Library of Ireland | Ms9146 | 1851 | Photocopy of a bond of Mary Thorp, widow, and Samuel... | |
| 3076 | National Library of Ireland | Ms10074 | c1850 | Statement of costs in the case of the estate of Rich... | |
| 3078 | National Library of Ireland | Ms14089 | c1850 | List of leases relating to the estates of the 4th Ea... | |
| 3620 | National Library of Ireland | Ms12766 | 1850 | Ennistymon (County Clare) Union Letter Book, mostly ... | |
| 9239 | National Library of Ireland | Ms15558 | 1850 | Xerox copies of two letters from William Cleburne, C... | |
| 9267 | National Library of Ireland | Ms15763 | 1837-1843
1850
1853 | Correspondence of Viscount and Lady Hardinge, 1837-1... | |
| 10076 | National Library of Ireland | Ms16134 | 1850-1851 | Renal of the estate of Lord Monck, County Wexford, 1... | |
| 10783 | National Library of Ireland | Ms20605 | 1850-1851 | Includes copies of letters relating to Arabella [Arb... | Rowan Papers |
| 10893 | National Library of Ireland | Ms21708 | [c1850?] | Letter from 1st Marquis of Dufferin of Ava relating ... | |
| 10935 | National Library of Ireland | Ms22249 | [c1850?] | Letter from M Martin, Dublin to [Mary --?] concernin... | |
| 11550 | National Library of Ireland | MsG389/1 | 1851 | Letter to John (O) Daly from [Mrs] M E Mackesey, Cas... | |
| 11584 | National Library of Ireland | Ms12209 | 1850 | Ballina Poor Law Union Minute Book, c2 February 1850... | |
| 11590 | National Library of Ireland | Ms12373 | 1850-1851 | Castlebar Poor Law Union Minute book, 25 May 1850-11... | |
| 11606 | National Library of Ireland | Ms12239 | 1851 | Belmullet Poor Law Union Minute Book, 22 May 1851-27... | |
| 11613 | National Library of Ireland | Ms12210 | 1850-1851 | Ballina Poor Law Union Minute book, 6 July 1850-1 Fe... | |
| 11614 | National Library of Ireland | Ms12211 | 1851 | Ballina Poor Law Union Minute Book, 1 February 1851-... | |
| 6496 | Public Record Office of Northern Ireland | D/1270 | 1851 | Letter from Mrs Whitelaw, Lebanon, Pennsylvania, Uni... | Jackson and Whitelaw Papers |
| 7924 | Public Record Office of Northern Ireland | T/1233/1 | c1850 | Copy of a map of Hamiltonsbawn, County Armagh, showi... | |
| 8136 | Public Record Office of Northern Ireland | T/1881/1 | 1851
1918 | Copy of the 1851 census returns relating to the Hann... | |
| 6767 | Public Record Office of Northern Ireland | D/2163 | 1851 | This collection of 3 documents includes a teacher... | |
| 7545 | Public Record Office of Northern Ireland | D/906/ | 1850
1857 | D/906/365/1 An account of an Irish woman's visit... | Perceval Papers |
| 7804 | Public Record Office of Northern Ireland | MIC/65/2 | 1850 | Microfilmed copy of the commonplace book of press cu... | Rowan-Hamilton (Killyleagh) Papers |
| 7915 | Public Record Office of Northern Ireland | T/1201/8 | 1851 | Typescript copy of a letter from Isabella Heygate, B... | |
| 8090 | Public Record Office of Northern Ireland | T/1719/1-2 | 1851 | Box containing Mormon genealogical record forms rela... | |
| 8203 | Public Record Office of Northern Ireland | T/2054/1 | 1850 | Copy of a letter from Mrs Nolan, Clara Upper, County... | |
| 8348 | Public Record Office of Northern Ireland | T/2484/1 | 1851 | Extract from the 1851 census of Ireland for the fami... | |
| 8578 | Public Record Office of Northern Ireland | T/3664 | 1850 | Copy of a letter from Marianne Gurd, Montreal, Canad... | |
| 8591 | Public Record Office of Northern Ireland | T/412/1 | c.1851 | Copy of a list of members in each tenant's house... | |
| 21465 | Queen's University Belfast Special Collections and Archives | MS74 | 1851
1922 | MS 1/6 Copy of an autograph song by Charles Wolfe, s... | QUB Miscellaneous Manuscripts |
| 4193 | Religious Society of Friends in Ireland Historical Library | Deed Box XIV/Folder 3:6 | 1850 | Elizabeth Haughton, Carlow: Signature to surrender o... | Deeds |
| 22094 | Representative Church Body Library | B10 | 1851 | Diocese of Cork, Ross and Cloyne, Visitation Book, 1... | St Fin Barre's Cathedral Cork Archive |
| 13850 | Sligo Archives Service | | 1850 | Rental of the estate of Godfrey Brereton in the baro... | Brereton Estate |
| 13851 | Sligo Archives Service | Estates volume 5 | 1850 | Rental of the Sligo estate of Henry Irwin (with maps... | Irwin Estate |
| 13852 | Sligo Archives Service | Estates Volume 5 | c1850 | Rental of the estate of Jeremiah Jones in the barony... | Jones Estate |
| 13853 | Sligo Archives Service | | c1850 | Rental of the late Owen Lloyd, c. 1850. | Lloyd Estate |
| 13140 | Tipperary Museum of Hidden History | AQNO1995.496 | 1850 | Lease, Viscount Lismore to Grace Heffernan, Coolanur... | |
| 13141 | Tipperary Museum of Hidden History | AQNO1995.504 | 1850 | Lease, Viscount Lismore to Ellen Flynn, Bantyre, 185... | |
| 19789 | Tipperary Studies | | 1850-1851 | Borrisokane Poor Law Union Rough Minute Book 1850-18... | Borrisokane Poor Law Union |
| 10375 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs873 | 1851 | Obituary of Anne Devilin, 1851, with an undated rece... | Madden Papers |
| 10411 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs5116 | 1798
1850
1856
1911 | Account of the rebellion of 1798 in Wexford dicated ... | Arnold Family |
| 19298 | Westmeath County Archives Department | | 1850 | 24 Copy of settlement on the marriage of Robert Gerr... | Howard Bury Papers |