| 14239 | Alexandra College | | 1878-1880 | Students' Representative Body Minute Book, 1878-... | |
| 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 |
| 16750 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1878-1880
1881-1894
1899-1910 | Vestry Books, parish of Templeneiry: 1878-1880, this... | Bolton Library Archive |
| 16763 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1878-1902 | Lismore Estate:Daily Rent Book, all five estates, sh... | Bolton Library Archive |
| 16820 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1878-1882
1885-1890
1895-1901 | Preachers' Books, Ballintemple:1895-19011885-189... | Bolton Library Archive |
| 16837 | Cashel, Ferns and Ossory Diocesan Archive (CoI) | | 1878-1990 | Clonbeg Baptismal Register 1878-1990, 1 volume. | Bolton Library Archive |
| 4232 | Church of Ireland Centre | Ms111 | 1865-1878 | Chairman's Committee Minute Book, 19 April 1865-... | Records of the Society for Promoting the Education of the Poor of Ireland |
| 16972 | Clare County Archives | | 1878-1896 | Minutes under the Contagious Diseases Act:February 1... | Kilrush Poor Law Union |
| 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 |
| 2265 | Erasmus Smith Schools Archives | ES/1079-ES/1158 | 1873-1878 | ES/1094 Letter to the (?secretary) to the trustees: ... | English Schools |
| 19870 | Erasmus Smith Schools Archives | | 1869-1878 | Registrar's vouchers, salary receipts and mainte... | Erasmus Smith Archives |
| 20472 | Galway County Council Archives | | 1873-1878
1887-1897 | UDC Letterbooks:December 1873-April 1878February 188... | Ballinasloe Urban District Council & Town Commissioners |
| 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) |
| 22159 | Irish Jesuit Archives | J27/ | 1863-1878 | 106 A file relating to Rosa Mulholland (Lady Gilbert... | Papers of Fr Matthew Russell, SJ (1834 - 1912) |
| 22160 | Irish Jesuit Archives | J27/ | 1878-1880 | 110 1 January 1878 - 29 July 1880. A file of letters... | Papers of Fr Matthew Russell, SJ (1834 - 1912) |
| 22173 | Irish Jesuit Archives | J27/ | 1878-1901 | 150 23 May 1878 -15 December 1901. A file of letters... | Papers of Fr Matthew Russell, SJ (1834 - 1912) |
| 22182 | Irish Jesuit Archives | N8/ | 1876-1878 | 21 [ ] 1876 -26 November 1878. A file of letters fro... | Papers of Revd Dr Charles William Russell (1812-1880) |
| 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 |
| 12200 | Kerry Local Studies and Archives Department | Sl/O'C/46 | 1878 | Marriage agreement between Laurence Kavanagh, Ballin... | O'Connell Solicitors |
| 20811 | Kildare Local Studies, Genealogy and Archives Department | Miscellaneous Records | 1875-1878
1878-1880 | Register of Admission and Discharge, 21 September 18... | Athy Poor Law Union |
| 3362 | Kilkenny Local Studies Department | BG101/AM/1 | 1878-1895 | Kilkenny Poor Law Union, Contagious Diseases Animals... | Kilkenny Poor Law Union |
| 21047 | King's Hospital School | 116-130 | 1876-1878 | 129 Cash Book, 1876 - 1878. | King's Hospital Records |
| 21158 | King's Hospital School | 232-236A | 1866-1878 | 231 Account Book, 1866 - 1878. | King's Hospital Records |
| 22295 | Leitrim Local Studies Department | | 1878-1904 | Carrick-on-Shannon Petty Sessions:Circulars to Magis... | |
| 18815 | Limerick Archives | BG 110 | 1878-1893 | IV. Contagious Diseases (Animals) Committee Minutes:... | Limerick Poor Law Union |
| 5756 | Maynooth University and St Patrick's College, Maynooth | SH/20-21 | 1872-1878 | SH20 Correspondence, Letters etc., volume 1: Margare... | Shearman Papers |
| 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 |
| 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 |
| 22821 | Methodist Historical Society of Ireland | | 1878-1999 | Soft bound volumes of yearly reports and agenda for ... | |
| 22822 | Methodist Historical Society of Ireland | | 1816-1878 | Primitive Wesleyan Methodist Conference: Printed bou... | |
| 22835 | Methodist Historical Society of Ireland | | 1878-1886 | Frederick Street Methodist Church, Belfast:Trustees ... | |
| 22847 | Methodist Historical Society of Ireland | | 1798-1878 | 3 volumes of Methodist class tickets, 1798-1878. | |
| 559 | National Archives of Ireland | BG/137/ | 1870-1878 | Rathdown Poor Law Union Minute Books:A54 Half year e... | Rathdown Poor Law Union and Rural District Council |
| 560 | National Archives of Ireland | BG/137/ | 1878-1886 | Rathdown Poor Law Union Minute Books:A71 Half year e... | Rathdown Poor Law Union and Rural District Council |
| 3957 | National Archives of Ireland | CSO/ICR1 | 1848-1878 | Return of Outrages, 1848-1878: Printed return of out... | Irish Crimes Records |
| 4103 | National Archives of Ireland | 3/714/1-10 | 1878-1888 | Irish Land League and Irish National League Papers 1... | Police and Crime Records |
| 11465 | National Archives of Ireland | 1189/3 | 1878-1887 | Correspondence between John Woulfe Flanagan and Mill... | Woulfe Flanagan |
| 14019 | National Archives of Ireland | Accession no. 1124 | 1713-1878 | Miscellaneous estate papers for Dublin City and Coun... | W.J. Shannon & Co. solicitors |
| 15254 | National Archives of Ireland | 2001/99 | 1873-1878 | National School records for Timolin. Co. Kildare. | National Schools, Private Accessions |
| 15262 | National Archives of Ireland | 2002/78 | 1878-1920 | National School records for Glenealy, Co. Wicklow. | National Schools, Private Accessions |
| 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 |
| 1993 | National Library of Ireland | Ms7543 | 1823-1878 | Includes extracts of letters from Larcom to his moth... | Larcom Papers |
| 2364 | National Library of Ireland | Ms5951 | 1874-1878 | Letters to E Fitzgerald, Knight of Kerry. Large alb... | |
| 9341 | National Library of Ireland | Mss23578-23667 | 1878-1942 | Ninety two letterbooks of the Ormonde estate, contai... | Ormonde Papers |
| 9355 | National Library of Ireland | Mss23899-23910 | 1878-1949 | Head Rent, Tithe Rent Charges and City Rent Books of... | Ormonde Papers |
| 9356 | National Library of Ireland | Mss23913-23914 | 1878-1888 | Two Rent Books, Neenagh district estates of the Marq... | Ormonde Papers |
| 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 |
| 10075 | National Library of Ireland | Ms16130 | 1878-1931 | Accounts of Hamilton estate, Abbotstown, County Dubl... | |
| 10651 | National Library of Ireland | Mss16627-16683 | 1878-1903 | Diaries of Mary Hayden, Irish historian, 1878-1903, ... | |
| 11077 | National Library of Ireland | Mss19420-19421 | 1875-1878 | Two Debtors' Ledgers of Denis O'Neill, general merch... | |
| 11923 | National Library of Ireland | Ms12582-12588 | 1878-1884 | Swinford Poor Law Union Minute Books: Ms12,582 Jul... | Swinford Poor Law Union |
| 18885 | Offaly Archives | OCL GJ1/1; GJ1/2 | 1830-1868
1852-1878 | 16 Presentment or 'Jobs' Books for the years 1830-18... | Records of King's County Grand Jury |
| 16696 | Presentation Sisters Congregational Archives | | 1777-1878 | 1777-1878, two slim copy books with records of entra... | Presentation Sisters South West Province - South Presentation Community |
| 6776 | Public Record Office of Northern Ireland | D/2202 | 1878-1963 | Records of Durham Street Weaving Company Limited, Be... | |
| 7479 | Public Record Office of Northern Ireland | D/4143 | 1878-1919 | 2 volumes of service records of post office employee... | |
| 7516 | Public Record Office of Northern Ireland | D/639/311 | 1878 | Letter regarding Porters' Female National School... | |
| 6491 | Public Record Office of Northern Ireland | D/1248/LF/1-16; D/1248/O/ | 1837-1878 | Accounts of Tandragee Loan Fund and Moral Agency, in... | Tandragee Estate Papers |
| 6612 | Public Record Office of Northern Ireland | D/1738 | 1878-1881 | This collection of 23 documents includes letters fro... | |
| 7247 | Public Record Office of Northern Ireland | D/3351 | 1878-1894 | 9 documents relating to the genealogy of the Gordon... | |
| 7455 | Public Record Office of Northern Ireland | D/4088 | 1855-1878 | This collection of Hamilton of Brown Hall papers, in... | |
| 8442 | Public Record Office of Northern Ireland | T/2700 | 1830-1878 | T/2700/2 Copy of an emigrant letter from Matthew Br... | |
| 8582 | Public Record Office of Northern Ireland | T/3764 | 1878-1883 | Transcribed diary of Eliza Corscadden, Manorhamilton... | |
| 8605 | Public Record Office of Northern Ireland | T/477/2 | c.1862-c.1878 | Copies of miscellaneous family notes taken from an o... | |
| 8700 | Public Record Office of Northern Ireland | T/847/1-5 | 1865-1878 | Copy of the rental of the estate of Mrs A M Seaver, ... | |
| 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. |
| 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 |
| 5310 | Religious Society of Friends in Ireland Historical Library | MMIII/J1 | 1866-1878 | Accounts: Accounts of Edenderry Monthly Meeting, 186... | Edenderry Monthly Meeting |
| 9975 | Religious Society of Friends in Ireland Historical Library | PM/Car /I/B | 1862-1878 | Carlow Preparative Meeting, Women's Minutes, 1862-18... | |
| 11120 | Religious Society of Friends in Ireland Historical Library | MM/XV1M2/Reel 42 | 1878-1919 | Richhill Monthly Meeting, Birth Notes and Birth Cert... | |
| 11121 | Religious Society of Friends in Ireland Historical Library | MM/XVIM3/Reel 42 | 1812-1878 | Richhill Monthly Meeting, Birth Register, 1812-1878,... | |
| 5052 | Representative Church Body Library | MS607/ | 1878-1992 | Chapel Records: 1: Vestry Minute Book, 1881-1967. C... | Records of the Mageough Home, Dublin |
| 23731 | Representative Church Body Library | MS607/ | 1878-1929 | Financial Records: 5: Volume of printed balance shee... | Records of the Mageough Home, Dublin |
| 22411 | Royal College of Physicians of Ireland | | 1878-1890
1891-1900 | Maternity Registers, 1891-1900. Patients Admission... | Sir Patrick Dun's Hospital |
| 22444 | Royal Victoria Hospital, Belfast | | 1863-1870
1871-1878 | Honorary Secretary's Minutes:1863-18701871-1878T... | |
| 22013 | St Brigid's Hospital, Ballinasloe | | 1863-1878 | Chaplains Report book:July 1863-1878 | Ballinasloe District Lunatic Asylum |
| 12121 | St Louis' Heritage Centre | MGB06/GB14-MGB11/GB14 | 1872
1878 | Material relating to Mother Genevieve Beale:MGB06/GB... | |
| 24288 | Tipperary County Archives | | 1878-1889 | Streets and Finance Committee Book:17 May 1878-25 Ju... | Clonmel Corporation |
| 19814 | Tipperary Studies | | 1878-1923 | Letters from the Local Government Board:January 1878... | Thurles Poor Law Union |
| 6393 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs10247/1/696-8 | 1862-1878 | Three letters of Charles Wynne from Clonsilla, Cupar... | Wynne Family Paper |
| 10182 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs4040 | 1878-1881 | A brief family history [diary] of Frances Mary Emma ... | Beaufort Papers |
| 10281 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs 6181 | 1834-1878 | Original hymns and poems of Julia Macleod (Sue), nee... | |
| 10338 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs4487 | 1876-1878 | Domestic Accounts Book belonging to a member of the ... | O'Sullivan/Solomons Collection |
| 10360 | Trinity College Dublin, Manuscripts and Archives Department | V/131/[D] | 1878-1888 | Rentals of the Tara Hill Estate, 1878-1888. | Courtown Papers |
| 10464 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs6885 | 1878-1890 | Correspondence of Mrs Anne Deane and John Dillon, 18... | Dillon Papers |
| 6863 | UCC Special Collections & Archives | BL/EP/G/644b | 1865-1878 | Diary and Account Books of George Grehan, volume, 18... | Grehan Estate Collection |
| 6862 | UCC Special Collections & Archives | BL/EP/G/603-635 | 1877-1878 | Letters to George Grehan from his sister-in- law, Ma... | |
| 4130 | UCD Special Collections | MS/18 | 1878 | Book of recipes for chemical remedies, perfumes, etc... | University College Dublin, Manuscripts |
| 24128 | Union Theological College | | 1878-1879 | 'National Association for Women's Suffrage, North of... | Union Theological College Pamphlet Collection |
| 24129 | Union Theological College | | 1878 | 'Ladies' National Association for the Abolition of t... | Union Theological College Pamphlet Collection |
| 24130 | Union Theological College | | 1878 | 'Opinion on Women's Suffrage' (no author noted, Manc... | Union Theological College Pamphlet Collection |
| 5973 | Waterford City Archives | HG/5/ | 1878-1884 | New Hospital at Hennessy's Road: 12: [March 1884... | Records Relating to the Holy Ghost Hospital |
| 5978 | Waterford City Archives | HG/6/ | 1878-1886 | Case at Law Trustess versus Slaney: 13: [1882, 1883,... | Records Relating to the Holy Ghost Hospital |
| 19257 | Westmeath County Archives Department | | 1878-1972 | Valuation Lists:1878-1972 | Westmeath County Council |
| 19310 | Westmeath County Archives Department | | 1878 | 114 C Brinsley Marlay Esq. to Miss Anne Whelehan an... | Howard Bury Papers |