| An economic analysis of a National Theatre : The case of the ‘Abbey’ | O'Hagan, John W. | Article in Journal | | 1996 |
| Consumption and living conditions, 1750–2016 | Bielenberg, AndyO'Hagan, John | Article in Book | | 2016 |
| Home Rule : l'antonomia Irlandese | Hagan, John | Monograph or Collective Volume | Bretschneider (Libraio Editore) | 1913 |
| Miscellanea Vaticano-Hibernica | | Article in Journal | | 1916 |
| Miscellanea Vaticano-Hibernica | | Article in Journal | | 1917 |
| Miscellanea Vaticano-Hibernica (1572-1585) (Vatican Archives : the nunciatures) | | Article in Journal | | 1922 |
| Miscellanea Vaticano-Hibernica, 1420-1631 (Vatican Archives : Borghese Collection) | | Article in Journal | | 1915 |
| Miscellanea Vaticano-Hibernica, 1580-1631 (Vatican Archives : Borghese Collection) | | Article in Journal | | 1914 |
| Some papers relating to the Nine Years' War (Vatican Archives : Borghese Collection, Series III, Vol. 124 C.) | | Article in Journal | | 1913 |
| The Arts and the Wealth of Nations: the Role of the State | O'Hagan, John | Article in Journal | | 2009 |
| The economy | Murphy, PatrickO'Hagan, JohnRedmond, Adrian | Article in Book | | 2000 |
| The economy of Ireland : national and sectoral policy issues | | Monograph or Collective Volume | Gill & Macmillan | 2008 |
| The Irish economy 1973 to 2016 | O'Hagan, John | Article in Book | | 2018 |
| Trinity/UCD rugby in the late 1960s | O'Hagan, John | Article in Book | | 2003 |
| Wine from the royal pope | MacFaelain, C. L. [i.e. Hagan, John] | Article in Journal | | 1930 |