| National parliaments within the enlarged European Union J O’Brennan, T Raunio From “victims” of integration to competitive actors, 2007 | 223 | 2007 |
| The eastern enlargement of the European Union J O'Brennan Routledge, 2006 | 213 | 2006 |
| ‘On the slow train to nowhere?’The European Union,‘enlargement fatigue’and the Western Balkans J O’Brennan European Foreign Affairs Review 19 (2), 2014 | 111 | 2014 |
| Introduction: deparliamentarization and European integration J O’BRENNAN, T Raunio National parliaments within the enlarged European Union, 17-42, 2007 | 89 | 2007 |
| Ireland says no (again): The 12 June 2008 referendum on the Lisbon Treaty J O'Brennan Parliamentary Affairs 62 (2), 258-277, 2009 | 52 | 2009 |
| ‘Bringing Geopolitics Back In’: Exploring the Security Dimension of the 2004 Eastern Enlargement of the European Union J O'Brennan Cambridge Review of International Affairs 19 (1), 155-169, 2006 | 46 | 2006 |
| Enlargement fatigue and its impact on the enlargement process in the Western Balkans J O’Brennan The Crisis of EU Enlargement. IDEAS Special Report 18, 36-44, 2013 | 42 | 2013 |
| The EU and the Western Balkans: stabilization and Europeanization through enlargement J O'Brennan Routledge, 2011 | 37 | 2011 |
| Requiem for a shared interdependent past: Brexit and the deterioration in UK-Irish relations J O’Brennan Capital & Class 43 (1), 157-171, 2019 | 29 | 2019 |
| ireland's return to ‘normal’voting patterns on EU issues: the 2002 nice treaty referendum J O'Brennan European Political Science 2 (2), 5-13, 2003 | 29 | 2003 |
| Re-Conceptualising Europe: Social Constructivism and EU Enlargement J O’Brennan Actors and models, Assessing the European Union’s External Capability and …, 2001 | 29* | 2001 |
| From stabilization to consolidation: Albanian state capacity and adaptation to European Union rules J O'Brennan, E Gassie Journal of Balkan and Near Eastern Studies 11 (1), 61-82, 2009 | 28 | 2009 |
| The European commission, enlargement policy and civil society in the Western Balkans J O’Brennan Civil Society and Transitions in the Western Balkans: Societies and the …, 2013 | 25 | 2013 |
| Conclusion: national parliaments gradually learning to play the European game? J O’BRENNAN, T Raunio National parliaments within the enlarged European Union, 288-302, 2007 | 21 | 2007 |
| The EU in the western Balkans: Enlargement as empire? A response to David Chandler J O'Brennan Global society 22 (4), 507-518, 2008 | 20 | 2008 |
| The dual crisis in Irish foreign policy: the economic crash and Brexit in a volatile European landscape N Rees, J O’Brennan Irish Political Studies 34 (4), 595-614, 2019 | 19 | 2019 |
| Ireland and the Lisbon Treaty: quo vadis? J O'Brennan CEPS Policy Briefs Paper, 2008 | 19 | 2008 |
| Ireland's National Forum on Europe: Elite deliberation meets popular participation J O'BRENNAN Journal of European Integration 26 (2), 171-189, 2004 | 18 | 2004 |
| European scrutiny in national parliaments: individual efforts in the collective interest? P Kiiver National Parliaments within the Enlarged European Union, 82-94, 2007 | 17 | 2007 |
| Government and parliament J O'Brennan Royal Irish Academy, 2012 | 13 | 2012 |
