| 'Slow learners'? Comparing the Sunningdale Agreement and the Belfast/Good Friday Agreement | Hennessey, Thomas | Article in Book | | 2017 |
| A history of Northern Ireland, 1920-1996 | Hennessey, Thomas | Monograph or Collective Volume | Gill & Macmillan | 1997 |
| Dividing Ireland : World War One and partition | Hennessey, Thomas | Monograph or Collective Volume | Routledge | 1998 |
| Historic loyalism : allegiance, patriotism, Irishness and Britishness in Ireland | Hennessey, Thomas | Article in Book | | 2011 |
| Negotiating the Belfast agreement | Hennessey, Thomas | Article in Book | | 2009 |
| Northern Ireland : the origins of the Troubles | Hennessey, Thomas | Monograph or Collective Volume | Gill & Macmillan | 2005 |
| Pearse's legacy : the partition of Ireland | Hennessey, Thomas | Article in Book | | 2009 |
| Same but different? the Democratic Unionist Party and Ulster Unionist Party compared | Braniff, MáireHennessey, ThomasMcAuley, James W.Tonge, JonathanWhiting, Sophie A. | Article in Journal | | 2020 |
| The Democratic Unionist Party : from protest to power | Braniff, MaireHennessey, ThomasMcAuley, James W.Tonge, JonathanWhiting, Sophie | Monograph or Collective Volume | Oxford University Press | 2014 |
| The evolution of the Troubles, 1970-72 | Hennessey, Thomas | Monograph or Collective Volume | Irish Academic Press | 2007 |
| The evolution of Ulster Protestant identity in the twentieth century: nations and patriotism | Hennessey, Thomas | Article in Book | | 2008 |
| The first Northern Ireland peace process : power-sharing, Sunningdale and the IRA ceasefires, 1972-76 | Hennessey, Thomas | Monograph or Collective Volume | Palgrave Macmillan | 2015 |
| The Great War and the Britannic question in Ireland: concepts of national and imperial identity among Irish nationalists and unionists | Hennessey, Thomas William | Thesis | | 1995 |
| The Northern Ireland peace process : ending the troubles? | Hennessey, Thomas | Monograph or Collective Volume | Gill & Macmillan | 2000 |
| The origins of the peace process | Hennessey, Thomas | Article in Book | | 2011 |
| The politics of Northern Ireland | Hennessey, Thomas | Article in Book | | 2005 |
| Ulster unionism and loyalty to the crown of the United Kingdom, 1912-74 | Hennessey, Thomas | Article in Book | | 1996 |
| Unionism and consent: problems with a principle? | Hennessey, Thomas | Article in Book | | 2011 |