| A note on the Tullamore town improvements, 1860 | O'Neill, Timothy P. | Article in Journal | | 2006 |
| Cholera in Offaly in the 1830s | O'Neill, Timothy P. | Article in Journal | | 2003 |
| Clare and Irish poverty, 1815-51 | O'Neill, Timothy P. | Article in Journal | | 1974 |
| Doing local history | O'Neill, Timothy P. | Article in Journal | | 2001 |
| Famine evictions | O'Neill, Timothy P. | Article in Book | | 2000 |
| Fever and public health in pre-Famine Ireland | O'Neill, Timothy P. | Article in Journal | | 1973 |
| Fish, historians and the law: the Foyle Fishery case | O'Neill, Timothy P. | Article in Journal | | 2009 |
| Gigginstown and crown lands in Westmeath in the early 1800s | O'Neill, Timothy P. | Article in Book | Geography Publications | 2022 |
| Life and tradition in rural Ireland | O'Neill, Timothy P. | Monograph or Collective Volume | Dent | 1977 |
| Minor famines and relief in County Galway 1815-1925 | O'Neill, Timothy P. | Article in Book | | 1996 |
| Navan and the cholera epidemic of 1832 | O'Neill, Timothy P. | Article in Journal | | 2020 |
| Navan: the Earl of Essex, Baroness de Ros and the Crown lands of the early nineteenth century | O'Neill, Timothy P.
| Article in Journal | | 2022 |
| Offaly : history and society : interdisciplinary essays on the history of an Irish county | | Monograph or Collective Volume | Geography Publications | 1998 |
| Poverty in Ireland in the first half of the nineteenth century | O'Neill, Timothy P. | Thesis | | 1971 |
| Poverty in Ireland, 1815-45 | O'Neill, Timothy P. | Article in Journal | | 1973 |
| The Catholic church and relief of the poor, 1815-45 | O'Neill, Timothy P. | Article in Journal | | 1973 |
| The charities and famine in mid-nineteenth-century Ireland | O'Neill, Timothy P. | Article in Book | NA | 1999 |
| The famine in Offaly | O'Neill, Timothy P. | Article in Book | | 1998 |
| The Irish famine of 1822 | O'Neill, Timothy P. | Thesis | | 1965 |
| The persistence of famine in Ireland | O'Neill, Timothy P. | Article in Book | | 1995 |
| The Rices of Mountrice : solicitors' records of an epigonal family | O'Neill, Timothy P. | Article in Journal | | 1996 |
| Tools and things machinery on Irish farms 1700-1981 | O'Neill, Timothy P. | Article in Book | | 1982 |