| 14299 | Alexandra College | | 1940-1941 | File relating to the Evacuation of English Children ... | |
| 14652 | Association of Baptist Churches in Ireland | | 1940-1945 | A file of 43 letters, mostly in Spanish, but with so... | Irish Baptist Home and Foreign Mission |
| 14668 | Association of Baptist Churches in Ireland | | 1940- | Annual reports of the Baptist Union of Ireland, 1940... | Irish Baptist Home and Foreign Mission |
| 15018 | Catholic Girl Guides of Ireland | | 1940-1970 | Folder containing correspondence with other organisa... | |
| 15024 | Catholic Girl Guides of Ireland | | 1940-1974 | Five folders containing correspondence relating to t... | |
| 15025 | Catholic Girl Guides of Ireland | | 1940-1970 | Catholic Girl Guides of Ireland, Creditors Ledger, c... | |
| 15056 | Catholic Girl Guides of Ireland | | 1940-1960 | Folder containing correspondence relating to events,... | |
| 15099 | Catholic Girl Guides of Ireland | | 1940-1966 | House Committee Cash Book, Catholic Girl Guides of t... | |
| 6069 | Clare County Archives | | 1940-1941 | Minutes of Clare County Board of Health, General Ass... | County Clare Board of Health |
| 6070 | Clare County Archives | | 1940-1942 | Minutes of Clare County Board of Health, General Ass... | County Clare Board of Health |
| 6135 | Clare County Archives | 143-44 | 1940-1969 | Town Commission Personnel, employees: 143 1959 - 19... | |
| 23821 | Cork City and County Archives | | 1940-1970
1914 | Corporation Year Books 1914, 1940-1970 | Cork City Council Records - Miscellaneous |
| 13760 | Cork Public Museum | AQNOL1996:141 | 1940-1963 | Statement(?) to the Military Service Pensions Board ... | Nora Wallace Collection |
| 3245 | Dún Laoghaire-Rathdown County Council | LA5/ | 1940-1950 | Register of Old Age Pension Claims and questions. Li... | Dún Laoghaire Borough |
| 3246 | Dún Laoghaire-Rathdown County Council | LA5/21 | 1940-1949 | Minutes of the School Attendance Committee responsib... | Dún Laoghaire Borough |
| 3264 | Dún Laoghaire-Rathdown County Council | LA5/ | 1940-1946 | Miscellaneous:644 Material relating to the bombing o... | Dún Laoghaire Borough |
| 180 | Irish Film Archive | Our Country | 1940-1949 | 'Our Country': A non fiction film. A short ... | |
| 195 | Irish Film Archive | Holy Ghost Fathers/1940s | 1940-1949 | 'Holy Ghost Fathers/1940s': A film about British Gu... | |
| 211 | Irish Film Archive | Grisewood-McEvoy/1940s | 1940-1949 | Grisewood-McEvoy/1940s: Amateur footage of convent ... | |
| 5150 | Irish Jesuit Archives | MACE/MCAU/ | 1940-1949 | 34 'Apothecaries Hall Shares: William's Prop... | John MacErlean SJ research on Mother Catherine McAuley (1778-1841). |
| 1365 | Irish Theatre Archive | ITA/131/4/118-141 | 1940-1960 | Ursula Doyle's Early Career, 25 photographs, c.1... | Jimmy O'Dea Collection |
| 13759 | Kilmainham Gaol Museum | 21LR-1B24-5 | 1940-1943 | Correspondence regarding Miss Stella Archer's pe... | History General |
| 13761 | Kilmainham Gaol Museum | 21LR-1B24-4 | 1940-1981 | Pension files for Miss Stella Archer, 1940 to 1981. | History General |
| 21001 | King's Hospital School | 83-99 | 1940-1957 | 85 Ledger, 1940 - 1957. | King's Hospital Records |
| 21063 | King's Hospital School | 131-144 | 1940-1950 | 134 Cash Received Book, 1940 - 1950. | King's Hospital Records |
| 21161 | King's Hospital School | 232-236A | 1940-1949 | 232B Account Book, stationery, 1940 - 1949. | King's Hospital Records |
| 21612 | Laois Local Studies | B/ | 1940-1945 | 70. Account Book, 1940-1945. | Laois County Council |
| 14491 | Mayo Local History Department | | 1940-1967 | Scrap Book containing advertisements, 1940-1967 | Mayo County Council |
| 14531 | Mayo Local History Department | | 1940-1989 | Administrative Files, 1940s-1980s, includes Road Fil... | Castlebar Urban District Council |
| 14540 | Mayo Local History Department | | 1940-1970 | Administration files relating to housing, sanitary s... | Ballina Urban District Council |
| 5782 | Meath Local Studies and Family History Department | UDC/I/C/ | 1940-1952 | Registers:North and South District, year ended:14 31... | Navan Urban District Council |
| 5793 | Meath Local Studies and Family History Department | UDC/I/D/ | 1940-1952 | Loans Miscellaneous:111 1952 Statement of the balanc... | Navan Urban District Council |
| 20259 | Meath Local Studies and Family History Department | FJC | 1940-1953 | Cash Receipts, January 1940 - October 1953. | F. and J. Clayton Company Records |
| 20262 | Meath Local Studies and Family History Department | FJC | 1940-1953 | Order Book, January 1940-October 1953. | F. and J. Clayton Company Records |
| 20376 | Meath Local Studies and Family History Department | UDC/I/G/ (Individual Houses) | 1940-1948 | 38 1940-1948. File concerns proposal of Mr Christoph... | Navan Urban District Council |
| 21286 | Meath Local Studies and Family History Department | UDC/I/L/ | 1940-1941 | Benefit Services, Allotments, Supplies: 26 October 1... | Navan Urban District Council |
| 21573 | Monaghan County Museum | | 1867-1888
1940-1983 | School Registers, CBS Monaghan, 1867-1888, 1940-1983 | |
| 4680 | National Archives of Ireland | 239/102 | 1940-1941 | Death of Lady Isobella Annie Dudgeon, 1940-1941. | Department of Foreign Affairs |
| 4720 | National Archives of Ireland | | 1940-1945 | National School Registers: Roll No. 17164 County Ker... | Department of Education |
| 11997 | National Archives of Ireland | S12117B | 1940-1943 | File on Family Allowances 1940-1943, includes: Legis... | Department of An Taoiseach |
| 12219 | National Archives of Ireland | 98/17/1/5 | c.1940-c.1970 | Irish Housewives Association, Stationery: 1940s-1970... | Irish Housewives Association (Hilda Tweedy Papers) |
| 12238 | National Archives of Ireland | 98/17/8 | 1940-1959 | Non-documentary material, 1940s and 1950s: Irish Hou... | Irish Housewives Association (Hilda Tweedy Papers) |
| 15268 | National Archives of Ireland | 2002/83 | 1940-1983 | National School records for St Louis' Rathmines, Dub... | National Schools, Private Accessions |
| 9393 | National Library of Ireland | Mss24233-24238 | c1940-1950 | Typescript copies of plays by Blanaid Salkeld: `Over... | Le Brocquy Papers |
| 86 | National Maternity Hospital | H/10 | 1940-1954 | House Committee, Agenda Book, April 1940-September 1... | |
| 5458 | Newtown School, Waterford | BB/15 | c1940-1990 | 'Newtown Review', c1940-c1990. | |
| 19775 | North Down Museum | | c.1940-1947 | The collection includes, for example:A group photogr... | Pat Hudson Photographic Collection |
| 18863 | Offaly Archives | OCL BUDC30/7/1-2 | 1940-1967 | 2 Rent collection books -
BUDC30/7/1: March 1940 ... | Records of Birr Urban District Council |
| 6551 | Public Record Office of Northern Ireland | D/1525 | 1940-1950 | Records of the Nursery Centre Committee, 1940-1950. | |
| 6546 | Public Record Office of Northern Ireland | D/1512 | c.1940-c.1955 | General notes on the Bullick family, c.1656-c.1955 a... | |
| 7329 | Public Record Office of Northern Ireland | D/3722 | 1940-1946 | 14 files and volumes and c.30 documents relating to ... | |
| 7459 | Public Record Office of Northern Ireland | D/4096 | 1940-1991 | 84 volumes of records of the Northern Ireland Counci... | |
| 7537 | Public Record Office of Northern Ireland | D/847/25/13 | 1940-1941 | Papers about claim of Miss Mary McKenna, Cabragh, Du... | Longfield, Kelly and Armstrong Papers |
| 856 | Religious Society of Friends in Ireland Historical Library | P410 | 1940-1949 | Young Friends' Conference in Blackrock in 1940s. | Photographic Collections |
| 1222 | Religious Society of Friends in Ireland Historical Library | P416 | 1940-1947 | Young Friends: Filing Cabinet 3 Junior Yearly Meeti... | Photographic Collections |
| 23552 | Representative Church Body Library | RCBL MS 749 | 1940-1945 | Conference Sub-Committee Minutes, 21 February 1940-1... | Mothers' Union Collection |
| 24974 | Royal Irish Academy of Music | 1120/16 | 1940-1951 | 6: no date, air raid precaution notes, about gases, ... | |
| 11884 | Sligo Archives Service | Shelf A | 1940-1949 | Sligo Borough Rate Books:1940-1941 east ward (2)1940... | |
| 21989 | St Canice's Hospital, Kilkenny | | 1845-1857
1940-1950 | Case-Book:August 1845-May 1857c.1940-c.1950. | St Canice's District Lunatic Asylum |
| 21997 | St Canice's Hospital, Kilkenny | | 1940-1951 | Financial Statement Books:October 1940-April 1951 | St Canice's District Lunatic Asylum |
| 11198 | Trinity College Dublin, Manuscripts and Archives Department | V116 | 1940-1945 | Wages Book, weekly analysis, 1940-1945. | Courtown Papers |
| 11199 | Trinity College Dublin, Manuscripts and Archives Department | V117 | 1940-1945 | Daily Wages Book 1940-1945. | Courtown Papers |
| 10235 | Trinity College Dublin, Manuscripts and Archives Department | TCDMss10582/4/1-3 | 1940-1947 | 2 letters to Jean Mongomery: Thank you from E Prenti... | |
| 10395 | Trinity College Dublin, Manuscripts and Archives Department | TCDMs10066/291 | 1940-1954 | Letters and legal documents relating to the petition... | Denis Johnston Papers |
| 11262 | Trinity College Dublin, Manuscripts and Archives Department | TCDMicrofilm/139 | 1940-1946 | Microfilm of Music Notebooks and Compositions for 19... | |
| 1139 | UCC Special Collections & Archives | Box 2 | 1940-1980 | Contains material relating to Nancy McCarthy's c... | Nancy McCarthy Collection |
| 1046 | Waterford City Archives | Fin 7/3/ | 1940-1958 | Rates South Ward 4:27: 1940 - 194128: 1941 - 194229:... | Records of the Finance Department |
| 1730 | Waterford City Archives | | 1940-1944 | Operations Book, 7 June 1940- 24 August 1944. | Waterford City and County Infirmary |
| 4534 | Waterford City Archives | | 1940-1944 | Minute Book of Waterford City and County Infirmary, ... | Waterford City and County Infirmary |
| 5913 | Waterford City Archives | AAC 08 | 1940-1995 | Catalogues: Catalogues for annual exhibitions, detai... | Arts Advisory Committee |
| 23348 | Waterford City Archives | P27/ | 1940-1949 | Minute Books, Waterford County Council and City Bran... | Minute Books Waterford County Council and City Red Cross Society |
| 19262 | Westmeath County Archives Department | | 1940-1961 | Westmeath County Council Petty Cash Book:8 February ... | Westmeath County Council |
| 19266 | Westmeath County Archives Department | | 1940-1989 | Registers of Managers' Orders:1940-1989 | Westmeath County Council |
| 19404 | Westmeath County Archives Department | | 1940-1944 | Athlone Urban District Council Service of Notices Le... | Athlone Local Authority Records |