| O'Neill, Thomas Patrick, see also Ó Néill, TomásÓ Néill, Tomás, see also O'Neill, Thomas Patrick | Cross-reference | | |
| 'God save Ireland' | O'Neill, Thomas Patrick | Article in Journal | | 1943 |
| A perspective on Ireland | O'Neill, Thomas Patrick | Article in Book | | 1986 |
| Bishop Barrett and King Richard III | O'Neill, Thomas Patrick | Article in Book | | 1991 |
| Bookbinding in Ireland | Clarke, DesmondO'Neill, Thomas Patrick | Article in Journal | | 1955 |
| De Valera | O'Neill, Thomas PatrickÓ Fiannachta, Pádraig | Monograph or Collective Volume | Cló Morainn | 1968 |
| Discoverers & discoveries | O'Neill, Thomas Patrick | Article in Journal | | 1991 |
| Discoverers and discoveries : the Penal Laws and Dublin property | O'Neill, Thomas Patrick | Article in Journal | | 1983 |
| Dr J.C. McQuaid and Eamon de Valera : insights on church and state | O'Neill, Thomas Patrick | Article in Journal | | 1992 |
| Dutch engravings of the Williamite war, 1689 | O'Neill, Thomas Patrick | Article in Journal | | 1961 |
| Eamon de Valera | O'Neill, Thomas PatrickPakenham, Francis Aungier, 7th earl of Longford, 1905-2001 | Monograph or Collective Volume | Hutchinson | 1970 |
| Fintan Lalor and the 1849 movement | O'Neill, Thomas Patrick | Article in Journal | | 1950 |
| Food problems during the great Irish famine | O'Neill, Thomas Patrick | Article in Journal | | 1952 |
| Freemen and voters | O'Neill, Thomas Patrick | Article in Journal | | 1993 |
| From famine to near famine, 1845-79 | O'Neill, Thomas Patrick | Article in Journal | | 1961 |
| Galway's quincentennial, 1484-1984 | O'Neill, Thomas Patrick | Article in Journal | | 1984 |
| In search of a political path : Irish republicanism, 1922 to 1927 | O'Neill, Thomas Patrick | Article in Book | | 1977 |
| James Fintan Lalor | Goulding, JohnO'Neill, Thomas Patrick | Monograph or Collective Volume | Wexford Historical Publications | 2003 |
| James Fintan O'Neill | O'Neill, Thomas Patrick | Article in Book | | 1966 |
| Letters from James Fintan Lalor in Limerick | | Article in Journal | | 1952 |
| Libraries in Ireland | Clarke, DesmondO'Neill, Thomas Patrick | Article in Journal | | 1955 |
| Notes on Irish radical journals (1848-9) | O'Neill, Thomas Patrick | Article in Journal | | 1954 |
| Penal laws and convert rolls | O'Neill, Thomas Patrick | Article in Journal | | 1994 |
| Printers of the past | O'Neill, Thomas Patrick | Article in Journal | | 1952 |
| Private sessions of second Dáil : minutes of proceedings, 18 August 1921 to 14 September 1921 and report of debates 14 December 1921 to 6 January 1922 = Suíonna príobhaideacha an dara Dáil : miontuairiseí na nimeachtaí 18 Lúnasa 1921 go 14 Meán Fómhair 1921 agus tuairisc na ndíospóireachtaí 14 Nollaig 1921 go 6 Eanáir 1922 | | Monograph or Collective Volume | The Stationery Office | 1972 |
| Religion, land and laws in eighteenth century Thomond | O'Neill, Thomas Patrick | Article in Journal | | 1991 |
| Rentals of encumbered estates | O'Neill, Thomas Patrick | Article in Journal | | 1994 |
| Rural life | O'Neill, Thomas Patrick | Article in Book | | 1957 |
| Sidelights on souperism | O'Neill, Thomas Patrick | Article in Journal | | 1949 |
| Sources for a history of Catholic life in Ireland, 1780-1850 | O'Neill, Thomas Patrick | Article in Journal | | 1960 |
| Sources of Irish local history. 1st series | O'Neill, Thomas Patrick | Monograph or Collective Volume | Library Association | 1958 |
| Sources of local history | O'Neill, Thomas Patrick | Article in Journal | | 1958 |
| Surnames of County Galway | O'Neill, Thomas Patrick | Article in Journal | | 1994 |
| The Anglo-Irish treaty | Gallagher, FrankO'Neill, Thomas Patrick | Monograph or Collective Volume | Hutchinson | 1965 |
| The Catholic clergy and the great famine | O'Neill, Thomas Patrick | Article in Journal | | 1956 |
| The economic and political ideas of James Fintan Lalor | O'Neill, Thomas Patrick | Article in Journal | | 1950 |
| The Famine and its consequences | O'Neill, Thomas Patrick | Article in Book | | 1957 |
| The famine in Carlow | O'Neill, Thomas Patrick | Article in Journal | | 1947 |
| The Famine in Kilkenny | O'Neill, Thomas Patrick | Article in Journal | | 1958 |
| The food crisis of the 1890's | O'Neill, Thomas Patrick | Article in Book | | 1989 |
| The general election, 1918 | O'Neill, Thomas Patrick | Article in Journal | | 1968 |
| The great Irish famine, 1845-1852 | O'Neill, Thomas Patrick | Article in Journal | | 1995 |
| The Great Irish Famine, 1845-52 | O'Neill, Thomas Patrick | Article in Journal | | 1947 |
| The Irish land question, 1830-50 | O'Neill, Thomas Patrick | Article in Journal | | 1955 |
| The Irish workhouses during the Great Famine | O'Neill, Thomas Patrick | Article in Journal | | 1958 |
| The organisation and administration of relief, 1845-52 | O'Neill, Thomas Patrick | Article in Book | | 1956 |
| The organisation and administration of relief, 1845-52 | O'Neill, Thomas Patrick | Article in Book | | 1994 |
| The papers of James Fintan Lalor in the National Library | O'Neill, Thomas Patrick | Article in Journal | | 1948 |
| The scientific investigation of the failure of the potato crop in Ireland | O'Neill, Thomas Patrick | Article in Journal | | 1946 |
| The scientific investigation of the failure of the potato crop in Ireland, 1845-6 | O'Neill, Thomas Patrick | Article in Journal | | 1946 |
| The Society of Friends and the Great Famine | O'Neill, Thomas Patrick | Article in Journal | | 1950 |
| The tribes and other Galway families | O'Neill, Thomas Patrick | Monograph or Collective Volume | Connacht Tribune | 1984 |
| Young Ireland centenary : a symposium | Knowlan, K. B.O'Neill, Thomas Patrick | Article in Journal | | 1946 |
| Young Ireland centenary : a symposium | Nowlan, Kevin B.O'Neill, Thomas Patrick | Article in Journal | | 1946 |