| A call to arms | O'Brien, Paul | Article in Journal | | 2014 |
| A conflict of interest | O'Brien, Paul | Article in Journal | | 2012 |
| A curious journey on the high seas | Murray, GarethO'Brien, Paul | Article in Journal | | 2013 |
| A question of duty : the Curragh incident 1914 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2014 |
| Battleground : the battle for the General Post Office | O'Brien, Paul | Monograph or Collective Volume | New Island | 2015 |
| Blood on the streets : 1916 & the battle for Mount Street Bridge | O'Brien, Paul | Monograph or Collective Volume | Mercier Press | 2008 |
| Bully's Acre : Dublin's oldest cemetery | O'Brien, Paul | Monograph or Collective Volume | Kilmainham Tales | 2011 |
| Crossfire : the batle of the Four Courts, 1916 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2012 |
| Death in the city : Dublin 1916 | O'Brien, Paul | Article in Journal | | 2015 |
| Descent into hell : Operation 'market garden' | O'Brien, Paul | Article in Journal | | 2013 |
| Dublin in flames, 1922 | O'Brien, Paul | Article in Journal | | 2012 |
| Emmet and Shelley : high priests of romantic nationalism | O'Brien, Paul | Article in Book | | 2013 |
| Field of fire : the battle of Ashbourne, 1916 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2012 |
| Fish and chips and the 1916 Rising | O'Brien, Paul | Article in Journal | | 2012 |
| Havoc : the auxiliaries in Ireland's War of Independence | O'Brien, Paul | Monograph or Collective Volume | Collins Press | 2017 |
| Honouring the dead | O'Brien, Paul | Article in Journal | | 2011 |
| Honouring the dead (Part 2) | O'Brien, Paul | Article in Journal | | 2011 |
| Post Office workers flex their muscle | O'Brien, Paul | Article in Book | | 2017 |
| Royal Hospital Kilmainham | O'Brien, Paul | Monograph or Collective Volume | Kilmainham Tales | 2014 |
| Sean O’Casey and the Irish Civil War | O'Brien, Paul | Article in Book | Cork University Press | 2024 |
| Shelley and Catherine Nugent : spirits of the age | O'Brien, Paul | Article in Journal | | 2005 |
| Shelley and revolutionary Ireland | O'Brien, Paul | Monograph or Collective Volume | Redwords | 2002 |
| Shells and Shamrocks: The National Shell Factory at Bilberry, 1917-1919 | O'Brien, Paul | Article in Journal | | 2018 |
| Shootout : the battle for St Stephen's Green, 1916 | O'Brien, Paul | Monograph or Collective Volume | New Island | 2013 |
| The Battle of Mount Street Bridge | O'Brien, Paul | Article in Journal | | 2017 |
| Uncommon valour : 1916 and the battle for the South Dublin Union | O'Brien, Paul | Monograph or Collective Volume | Mercier | 2010 |
| Women of substance | O'Brien, Paul | Article in Journal | | 2014 |
| Writers of the left : politics and culture in Ireland during the 1930s | O'Brien, Paul | Article in Book | | 2008 |
| “Determined Perseverance” : the Glynn family and business enterprise in Kilrush, 1811 – 1940 | O'Brien, Paul | Thesis | | 2016 |