| 14336 | Ardagh and Clonmacnoise Diocesan Archives (RC) | | 1877 | Letter no 6 To his mother, letter sent from Montrea... | Conroy Papers |
| 14337 | Ardagh and Clonmacnoise Diocesan Archives (RC) | | 1878 | Letter no 17 To his mother, letter sent from San Fr... | Conroy Papers |
| 14338 | Ardagh and Clonmacnoise Diocesan Archives (RC) | | 1878 | Letter no 26 From Sr Bernard, Convent of Mercy, St ... | Conroy Papers |
| 14339 | Ardagh and Clonmacnoise Diocesan Archives (RC) | | 1878 | Letter no 27 From Mary Byrne, Dundalk, expressing h... | Conroy Papers |
| 7568 | Down County Museum | DB356 | 1786-1872
1877 | Family tree and typescript relating to the McIlveen ... | |
| 20529 | Dublin City Library and Archive | Ch1/13 | 1877 | Ch1/13/15 Letter from Ed. Pennefather to Mansion Hou... | Mansion House Fund for Relief of Distress in Ireland |
| 18574 | Dublin Diocesan Archives (RC) | AB 5 (File IV, Misc) | 1878 | Miscellaneous letters addressed to Cardinal Cullen i... | McCabe Papers |
| 18575 | Dublin Diocesan Archives (RC) | AB 5 (File I, Nuns) | 1878 | 187850 items. Among them is, for example, 337/3/9 Sr... | McCabe Papers |
| 18576 | Dublin Diocesan Archives (RC) | AB 5 (File III, Priests) | 1878 | Secular Priests, 1878337/1/32: F. O'Carroll, Rus... | McCabe Papers |
| 3182 | Dún Laoghaire-Rathdown County Council | LA1/425 | 1877 | Graph detailing weekly fluctuations in the number of... | Blackrock |
| 50 | Irish Dominican Congregation Archives | G1 | 1878 | Decree in Latin from Propaganda Fide, 13 January 187... | Dominican Archives, Cabra |
| 4795 | Irish Jesuit Archives | N4/14 | 1878 | Letter to Mrs O'Hagan from Rose [Mulholland] wri... | Papers of Judge John O'Hagan (1822-1890) |
| 22183 | Irish Jesuit Archives | N8/ | 1878 | 23 10 October 1878. Letter from Dr Charles Russell, ... | Papers of Revd Dr Charles William Russell (1812-1880) |
| 21811 | Kerry Diocesan Archives (RC) | M27 | 1878 | Profession of Presentation Sisters, 1878, Rules of M... | Miscellaneous |
| 21816 | Kerry Diocesan Archives (RC) | McC6/1-6 | 1877 | Hayes, Dingle Convent, 1877 regarding money. | Daniel McCarthy, 1878-1881 |
| 12200 | Kerry Local Studies and Archives Department | Sl/O'C/46 | 1878 | Marriage agreement between Laurence Kavanagh, Ballin... | O'Connell Solicitors |
| 21892 | Kerry Local Studies and Archives Department | | 1877 | Deeds, Kerry Estate: No 80 18 December 1877. Lease f... | Listowel Papers |
| 21151 | King's Hospital School | 232-236A | 1877 | 225G Mercer's Rental, 1877. | King's Hospital Records |
| 20600 | Meath Local Studies and Family History Department | Box E/ | 1878 | 37 Consent of Bligh trustees of lease by Mary Connol... | Mountainstown Documents |
| 20604 | Meath Local Studies and Family History Department | Box E/ | 1878 | 15 Lease of land to Philip Garragan Jnr. At Newtown ... | Mountainstown Documents |
| 20605 | Meath Local Studies and Family History Department | Box E/ | 1877 | 16 Lease of land to John Carolan at Feeagh, Moynalty... | Mountainstown Documents |
| 20623 | Meath Local Studies and Family History Department | Box E/ | 1878 | 11 Lease of land by Charles Hamilton and other trust... | Mountainstown Documents |
| 20624 | Meath Local Studies and Family History Department | Box E/ | 1878 | 12 Lease of land at Newtown or Agheragh by Charles H... | Mountainstown Documents |
| 11367 | National Archives of Ireland | ED9/27 | 1877 | Ballingeary School, County Tipperary, Roll Number 67... | Department of Education/Commissioners of National Education |
| 11370 | National Archives of Ireland | ED9/54 | 1877 | Crosshaven School, County Cork, Roll No. 9474, trans... | Department of Education/Commissioners of National Education |
| 11371 | National Archives of Ireland | ED9/85 | 1877 | Ballinahone School, County Armagh, Roll No. 6832, di... | Department of Education/Commissioners of National Education |
| 11374 | National Archives of Ireland | ED9/148 | 1877 | Knockanevin School, County Cork, Roll No. 4123, atte... | Department of Education/Commissioners of National Education |
| 11375 | National Archives of Ireland | ED9/174 | 1877 | Ardfinnan Schools, County Tipperary, Roll Nos 6691 a... | Department of Education/Commissioners of National Education |
| 11376 | National Archives of Ireland | ED9/204 | 1877 | Kilmacrennan School, County Donegal, Roll No. 8461, ... | Department of Education/Commissioners of National Education |
| 11377 | National Archives of Ireland | ED9/221 | 1877 | Ballymackney School, County Louth, Roll No. 5501, cl... | Department of Education/Commissioners of National Education |
| 15347 | National Archives of Ireland | 99/56/9/7/vi | 1877 | Papers relating to Co. Donegal. Regrant of mortgage ... | Family and estate records. 1611-1948 |
| 15382 | National Archives of Ireland | 99/56/10/22/3 | 1878 | Papers relating to King's County. Succession Duty fo... | Family and estate records. 1611-1948 |
| 15395 | National Archives of Ireland | 99/56/10/30/3 | 1877 | Papers relating to King's County. Settlement of real... | Family and estate records. 1611-1948 |
| 15409 | National Archives of Ireland | 99/56/10/39/3 | 1877 | Papers relating to King's County. Appointment by Lew... | Family and estate records. 1611-1948 |
| 15415 | National Archives of Ireland | 99/56/10/44/1 | 1877 | Papers relating to King's County. Mortgage by Rev. W... | Family and estate records. 1611-1948 |
| 15416 | National Archives of Ireland | 99/56/10/44/2 | 1877 | Papers relating to King's County. Settlement on the ... | Family and estate records. 1611-1948 |
| 15419 | National Archives of Ireland | 99/56/10/45/1 | 1877 | Papers relating to King's County. Settlement on the ... | Family and estate records. 1611-1948 |
| 15420 | National Archives of Ireland | 99/56/10/45/2 | 1877 | Papers relating to King's County. Appointment of tru... | Family and estate records. 1611-1948 |
| 9619 | National Library of Ireland | Ms297 (3-4) | 1878 | Mrs Cloclough to: James Tierney, Barrow Island, leas... | Colclough Papers |
| 9636 | National Library of Ireland | Ms29767(37) | 1878 | Marriage settlement of Revd. Richard C Hallows and M... | Hibernian Mining Company Papers |
| 9713 | National Library of Ireland | Ms18035 | 1877-1878 | Correspondence of Edith O'Kelly and James J O'Kelly ... | Devoy Papers |
| 14763 | North Down Museum | | 1877 | Framed etched portrait of Harriot, Countess of Duffe... | |
| 7516 | Public Record Office of Northern Ireland | D/639/311 | 1878 | Letter regarding Porters' Female National School... | |
| 874 | Religious Society of Friends in Ireland Historical Library | Mss Box 9/Case III Lower | 1878 | Munster Female Bounty Fund, no date. Memo from J Ea... | Handlists: Mss Boxes, Pamphlets Boxes, etc. |
| 1189 | Religious Society of Friends in Ireland Historical Library | QMII/H7-8 | 1877 | Schools and Education: QMIII/H7 Papers relating to ... | Ulster Quarterly Meetings |
| 1308 | Religious Society of Friends in Ireland Historical Library | | 1877 | Scrap Books: Pim Album, red scrap book, 1877, of Eli... | Museum Collection |
| 4156 | Religious Society of Friends in Ireland Historical Library | Deed Box IX/Folder 9:2 | 1878 | Elizabeth Bulla, daughter of Timothy and Ruth, Edend... | Deeds |
| 12121 | St Louis' Heritage Centre | MGB06/GB14-MGB11/GB14 | 1872
1878 | Material relating to Mother Genevieve Beale:MGB06/GB... | |
| 12122 | St Louis' Heritage Centre | MGB15/GB14-MGB16/GB14 | 1877 | MGB15/GB14 Exercise book containing hand written re... | |
| 6862 | UCC Special Collections & Archives | BL/EP/G/603-635 | 1877-1878 | Letters to George Grehan from his sister-in- law, Ma... | |
| 6874 | UCC Special Collections & Archives | BL/EP/G/732 | 1877 | Diaries of Stephen Grehan. The volume for the year 1... | Grehan Estate Collection |
| 4130 | UCD Special Collections | MS/18 | 1878 | Book of recipes for chemical remedies, perfumes, etc... | University College Dublin, Manuscripts |
| 5962 | Waterford City Archives | TNC11/1 | 1877, 1919-1927 | Legal Proceedings Involving the Corporation: 1877, 1... | Records of the Town Clerk |
| 19310 | Westmeath County Archives Department | | 1878 | 114 C Brinsley Marlay Esq. to Miss Anne Whelehan an... | Howard Bury Papers |