| "Imperium in Imperio" : Irish Episcopal Imperialism in the Nineteenth Century | Barr, Colin | Article in Journal | | 2008 |
| 'A veritable hurricane of sectarianism' : The year 1920 and ethno-religious conflict in Australia | Kildea, Jeff | Article in Book | McGill-Queen's University Press | 2015 |
| 'An ambiguous awe' : Paul Cullen and the historians | Barr, Colin | Article in Book | Four Courts Press | 2011 |
| 'Hurrah for old Ireland!' : Irish Catholicism at the Cape of Good Hope | Barr, Colin | Article in Book | | 2015 |
| An Irish Dimension to a British Kulturkampf | Barr, Colin | Article in Journal | | 2005 |
| Catholic Ireland, 1740-2016 | Barr, ColinÓ Corráin, Daithí | Article in Book | | 2016 |
| Giuseppe Mazzini and Irish nationalism, 1845-70 | Barr, Colin | Article in Journal | | 2008 |
| Introduction | Barr, ColinO'Connor, Anne | Article in Book | | 2014 |
| Ireland's empire : the Roman Catholic church in the English-speaking world, 1829-1914 | Barr, Colin | Monograph or Collective Volume | Cambridge University Press | 2020 |
| Irish Diaspora | Barr, Colin | Article in Book | Oxford University Press | 2003 |
| Lord Acton's Irish elections | Barr, Colin | Article in Journal | | 2008 |
| Nation / Nazione : Irish nationalism and the Italian Risorgimento | | Monograph or Collective Volume | University College Dublin Press | 2014 |
| Newman's Irish university | Barr, Colin | Article in Book | | 2020 |
| Paul Cullen, Italy and the Irish Catholic imagination, 1826-70 | Barr, Colin | Article in Book | | 2014 |
| Paul Cullen, John Henry Newman and the movement to create a Catholic University in Ireland, 1854-60 | Barr, Colin | Thesis | | |
| Paul Cullen, John Henry Newman, and the Catholic University of Ireland, 1845-1865 | Barr, Colin | Monograph or Collective Volume | University of Notre Dame Press | 2003 |
| Religion and Greater Ireland : Christianity and Irish global networks, 1750-1950 | | Monograph or Collective Volume | McGill-Queen's University | 2015 |
| The European culture wars in Ireland : the Callan schools affair, 1868-81 | Barr, Colin | Monograph or Collective Volume | University College Dublin | 2010 |
| The failure of Newman's Catholic University of Ireland | Barr, Colin | Article in Journal | | 2001 |
| The Irish College, Rome and the appointment of Irish bishops to the United States 1830-1851 | Barr, Colin | Article in Book | | 2008 |
| The Irish Reform Act of 1868 | Barr, Colin | Article in Journal | | 2017 |
| The re-energising of Catholicism, 1790–1880 | Barr, Colin | Article in Book | | 2018 |
| University education, history, and the hierarchy | Barr, Colin | Article in Book | | 2003 |
| ‘The Leader of the Virgin Choirs of Erin’: St Brigid’s Missionary College, 1883–1914 | Barr, ColinLuminiello, Rose | Article in Book | | 2017 |
| “An Italian of the Vatican type” : the Roman formation of Cardinal Paul Cullen, Archbishop of Dublin | Barr, Colin | Article in Journal | | 2016 |