O'Brennan, John (2022) This is who he is: the sociopathic violence that defines Vladimir Putin. Dublin Review of Books, 142.

Kerr, Aphra, O'Brennan, John and Vazquez Mendoza, Lucia (2021) Gambling Trends, Harms and Responses: Ireland in an International Context. Project Report. Maynooth University, Maynooth.

O'Brennan, John (2021) Stuck in the Middle with EU (and the UK)? How Ireland navigates its relationships with the EU and UK postBrexit. The Journal of Cross Border Studies in Ireland, 16. ISSN 978-1-906444-19-8

Vazquez Mendoza, Lucia, Kerr, Aphra and O'Brennan, John (2020) Gambling: Identifying international trends, approaches and responses (MUSSI Working Paper Series no. 13). Working Paper. MUSSI, Maynooth, Co. Kildare, Ireland.

Murphy, Mary P. and O'Brennan, John (2019) Ireland and crisis governance: continuity and change in the shadow of the financial crisis and Brexit. Irish Political Studies, 34 (4). pp. 471-489. ISSN 0790-7184

O'Brennan, John (2019) Requiem for a shared interdependent past: Brexit and the deterioration in UK-Irish relations. Capital and Class, 43 (1). pp. 157-171. ISSN 0309-8168

O'Brennan, John (2016) The Western Balkans tinderbox. EURACTIV.

O'Brennan, John (2014) In From the Cold: Ireland and the Quest for accession to the European Communities. Dublin Review of Books, 60.

O'Brennan, John (2014) ‘On the Slow Train to Nowhere?’ The European Union, ‘Enlargement Fatigue’ and the Western Balkans. European Foreign Affairs Review, 19 (2). pp. 221-242. ISSN 1384-6299

Murphy, M.C. and O'Brennan, John (2014) Reflections on Forty Years of Irish Membership of the European Union (special issue). Administration, 62. ISSN 0001-8325

O'Brennan, John (2012) Bulgaria, the end of innocence. OpenDemocracy.

O'Brennan, John (2012) EU Enlargement 1989-2009: Actors, Institutions, and Literature. In: Handbook of the 1989 Revolutions. Sage, London, pp. 1-23. (Unpublished)

O'Brennan, John (2012) Government and Parliament. In: Foreign Policy in the Republic of Ireland. Royal Irish Academy, Dublin, pp. 1-15. (Unpublished)

O'Brennan, John and Ó Riain, Seán (2012) Ireland (and Europe) in Crisis: The Fiscal Compact, the referendum and the future of European Integration. Contribution to the Oireachtas Sub-Committee on the Fiscal Treaty. Other. UNSPECIFIED.

O'Brennan, John (2012) The European Commission, transnational Advocacy and civil society in the Western Balkans. In: The European Commission, transnational Advocacy and civil society in the Western Balkans. Routledge, London, pp. 1-21. (Unpublished)

O'Brennan, John (2011) Do we need a referendum? Sunday Business Post. p. 19. ISSN 0791-2617

O'Brennan, John (2011) A Europe of Judges. Social Europe Journal, July 5th, 2011.

O'Brennan, John (2011) Legal crisis looming for European project. The Gulf Times, July 19th, 2011.

O'Brennan, John (2011) Una Europa de Jueces? El Nuevo Dia, July 11th, 2011.

O'Brennan, John (2010) Ireland’s existential crisis: a contrary view. openDemocracy. pp. 1-6.

O'Brennan, John (2010) Ireland and the European Union: Mapping Domestic Modes of Adaptation and Contestation. In: Irish Business and Society. Gill & MacMillan, Dublin, pp. 379-397. ISBN 9780717149902

O'Brennan, John (2009) Ireland’s European referendum: second take, high stake. openDemocracy. pp. 1-5.

O'Brennan, John (2009) Anxious EU's future at stake. The Australian, September 29th, 2009.

O'Brennan, John and Gassie, Esmeralda (2009) From Stabilization to Consolidation: Albanian State Capacity and Adaptation to European Union Rules. Journal of Balkan and Near Eastern Studies, 11 (1). pp. 61-82. ISSN 1944-8953

O'Brennan, John (2009) Ireland says No (again): the 12 June 2008 Referendum on the Lisbon Treaty. Parliamentary Affairs, 62. pp. 258-277. ISSN 0031-2290

O'Brennan, John (2009) Irlanda decide otra vez. El Pais, September 30th, 2009.

O'Brennan, John (2009) Recession will be the wild card in second Irish treaty referendum. Europe's World, Spring, 2009.

O'Brennan, John (2008) Ireland’s plan to resurrect the Lisbon Treaty to be unveiled at the Brussels summit. CEPS Commentary. pp. 1-3.

O'Brennan, John (2008) EU-Déjà vu - Ireland's No to Lisbon. Federalist Debate, 21 (3). pp. 5-11.

O'Brennan, John (2008) Ireland & the Lisbon Treaty: Quo Vadis? CEPS Policy Brief (175). pp. 1-13.

O'Brennan, John (2008) The EU in the western Balkans: Enlargement as Empire? A Response to David Chandler. Global Society, 22 (4). pp. 507-518. ISSN 1360-0826

O'Brennan, John (2008) Kosovo: the hour of Europe. openDemocracy. pp. 1-4.

O'Brennan, John (2008) Alte Kräfte drängen Serbien in die Isolation. Die Welt, January 18th, 2008.

O'Brennan, John (2008) Building States without Society: European Union Enlargement and the Transfer of EU Social Policy to Poland and Hungary by Beate Sissenich. Slavic Review, 67 (4). pp. 1007-1008. ISSN 0037-6779

O'Brennan, John (2008) Ireland must vote on whether we remain a member of the EU. Irish Times, December 9th, 2008.

O'Brennan, John (2008) Ireland’s plan to resurrect the Lisbon Treaty to be unveiled at the Brussels summit: CEPS Commentary/4 December 2008. CEPS Commentary, December 4th, 2008.

O'Brennan, John (2008) Reflecting on a second Irish Lisbon referendum. EurActiv, November 10th, 2008.

O'Brennan, John (2008) Serbia to choose EU orbit or isolation. The Japan Times, January 18th, 2008.

O'Brennan, John (2008) The Irish think again about the Lisbon Treaty. China Daily, December 12th, 2008.

O'Brennan, John (2008) Will Ireland say 'yes' to Lisbon? The Guardian, December 8th, 2008.

O'Brennan, John (2007) Beyond Sovereignty: From Status Law to Transnational Citizenship? Hokkaido: Slavic Research Centre. Osamu Ieda (ed.). Slavic Review, 66 (3). pp. 532-533. ISSN 0037-6779

O'Brennan, John (2007) Conclusion: National parliaments gradually learning to play the European game? In: National parliaments within the enlarged European Union : from 'victims' of integration to competitive actors? Routledge advances in European politics (47). Routledge, Abingdon, pp. 245-261. ISBN 9780415399357

O'Brennan, John (2007) Introduction: Deparliamentarization through European Integration? In: National Parliaments within the Enlarged European Union: from ‘Victims’ of Integration to Competitive Actors? Routledge advances in European politics (47). Routledge, Abingdon, pp. 1-19. ISBN 9780415399357

O'Brennan, John (2006) 'Bringing Geopolitics Back In': Exploring the Security Dimension of the 2004 Eastern Enlargement of the European Union. Cambridge Review of International Affairs, 19 (1). pp. 155-169. ISSN 0955-7571

O'Brennan, John (2005) EU offer would boost reform in Turkey. Irish Times, September 28th, 2005.

O'Brennan, John (2004) Ireland's National Forum on Europe: Elite Deliberation Meets Popular Participation. Journal of European Integration, 26 (2). pp. 171-189. ISSN 0703-6337

O'Brennan, John (2004) Kosovo: can sharing of power ever work? Irish Times, March 30th, 2004.

O'Brennan, John (2003) Leadership Vacuum at heart of EU Exposed? Irish Times, December 17th, 2003.

O'Brennan, John (2002) EU Enlargement as a Factor in Ireland's Nice Treaty Referendum. Perceptions: Journal of International Affairs, 7 (3). pp. 78-94.

O'Brennan, John (2001) A Social Constructivist Perspective on Enlargement. In: Actors and models : assessing the European Union's external capability and influence. Euryopa Etudes (11). Institut européen de l'Université de Genève, Geneva, pp. 161-187. ISBN 9782940174119