| A Political casualty of the Easter Rising | O'Donnell, Seán | Article in Journal | | 2016 |
| Clonmel 1840-1900 : anatomy of an Irish town | O'Donnell, Seán | Monograph or Collective Volume | Geography Publications | 1999 |
| Clonmel 1900-1932 : a history | O'Donnell, Seán | Monograph or Collective Volume | Marlfield Publications | 2009 |
| Clonmel corporation, 1842-90: a municipal study | O'Donnell, Seán | Thesis | | 1996 |
| Donegal Gaelic football | O'Donnell, Sean | Article in Journal | | 1978 |
| Early American science : the Irish contribution | O'Donnell, Seán | Article in Journal | | 1983 |
| Early Irish scientists | O'Donnell, Seán | Article in Journal | | 1976 |
| Gilding the anemometer : Irish science of the past | O'Donnell, Seán | Article in Journal | | 1982 |
| Irish-American scientists | O'Donnell, Seán | Article in Journal | | 1979 |
| John Bagwell: politician and landlord (1811-1883) | O'Donnell, Seán | Article in Journal | | 2017 |
| Prelude to a Clonmel labour movement 1830-1900 | O'Donnell, Seán | Article in Journal | | 2004 |
| Some aspects of the famine in Clonmel | O'Donnell, Seán | Article in Journal | | 1998 |
| The first election to the reformed Clonmel Corporation 150 years ago | O'Donnell, Seán | Article in Journal | | 1992 |
| The Hills of Donegal | O'Donnell, Sean | Article in Journal | | 1978 |
| The inventive famine decade | O'Donnell, Seán | Article in Journal | | 1985 |
| The rise of Sinn Féin in Clonmel 1917-1918 | O'Donnell, Seán | Article in Journal | | 2018 |
| The works of William Dargan | O'Donnell, Seán | Article in Journal | | 1987 |
| William Rowan Hamilton, 1805-65 | O'Donnell, Seán | Article in Journal | | 1983 |