| An epoch in Irish history. Trinity College, Dublin : its foundation and early fortunes, 1591-1660 | Mahaffy, J. P. (John Pentland) | Monograph or Collective Volume | | 1903 |
| Notes on the architectural history of Trinity College | Mahaffy, J. P. (John Pentland) | Article in Journal | | 1911 |
| The library of Trinity College, Dublin : the growth of a legend | Mahaffy, J. P. (John Pentland) | Article in Journal | | 1903 |
| The origin and growth of pensioners in the colleges of Cambridge and in Dublin | Mahaffy, J. P. (John Pentland) | Article in Journal | | 1919 |
| Two early tours in Ireland | | Article in Journal | | 1914 |
| Who wants Home Rule? | Mahaffy, J. P. (John Pentland) | Article in Journal | | 1913 |
| Will Home Rule be Rome Rule? | Mahaffy, J. P. (John Pentland) | Article in Journal | | 1912 |