| "A compulsory and burdensome imposition" : billeting soldiers in medieval and early modern Ireland | Casey, Denis | Article in Book | De Gruyter | 2011 |
| 'A man of great power for a long time' : Tigernán Ua Ruairc and the Book of Kells | Casey, Denis | Article in Journal | | 2010 |
| 'What shall we hang - the holly, or each other' : Henry II's Christmas court (Dublin, 1171) | Casey, Denis | Article in Book | | 2025 |
| A Man of No Mean Standing. The Career and Legacy of Donnchad mac Briain (d.1064) | Casey, Denis | Article in Journal | | 2020 |
| A reconsideration of the authorship and transmission of 'Cogadh Gáedhel re Gallaibh' | Casey, Denis | Article in Journal | | 2013 |
| An Eighth-century royal conversation : Cathal mac Finnguini and Áed Allán at Tír da Glás, AD 737 | Casey, Denis | Article in Journal | | 2007 |
| An eleventh-century heist: stealing the Book of Kells | Casey, Denis | Article in Journal | | 2020 |
| Brian Boru and the book of Armagh | Casey, DenisMeehan, Bernard | Article in Journal | | 2014 |
| Brian Boru, the Book of Armagh and the Irish church in the tenth and eleventh centuries | Casey, Denis | Article in Book | | 2017 |
| Cáin Éimíne Báin ('The sacrifice of Éimíne Bán') and the rise of Uí Dúnlainge in the seventh and eighth centuries | Casey, Denis
| Article in Journal | | 2022 |
| Conchobor ua Maíl Shechnaill and the church of Kildalkey in the 'notitiae' of the Book of Kells (c. 1030s) | Casey, Denis | Article in Journal | | 2023 |
| Cork harbour in retrospect, 1910-1920 | Casey, Denis P. | Article in Journal | | 1968 |
| Derbforgaill and the expulsion of Diarmait Mac Murchada | Casey, Denis | Article in Journal | | 2019 |
| Dublin and the Gaelic Irish economy in the eleventh and twelfth centuries | Casey, Denis | Article in Book | | 2020 |
| Education and the Renaissance man: Christopher Nugent, Baron of Delvin | Casey, Denis | Article in Journal | | 2017 |
| Historical and literary representations of Brian Boru's burial in Armagh, 1014 AD | Casey, Denis | Article in Journal | | 2010 |
| How many cows did it take to make the Book of Kells? | Casey, Denis | Article in Book | | 2017 |
| Irish involvement in the First and Second Crusades : a reconsideration of eleventh- and twelfth-century evidence | Casey, Denis | Article in Journal | | 2014 |
| Irish pseudohistory in Conall Mag Eochagáin's "Annals of Clonmacnoise" | Casey, Denis | Article in Journal | | 2012 |
| Life after Brian : the high kingship | Casey, Denis | Article in Journal | | 2014 |
| Norse, Gaelic or Hiberno-Scandinavian? The airlabraid of tenth-century Dublin | Casey, Denis | Article in Book | | 2013 |
| Portmagee, Co. Kerry : the origins of an Atlantic smuggling village | Casey, Denis | Monograph or Collective Volume | Four Courts Press | 2023 |
| Studies in the exercise of royal power in Ireland, c.650-c.1200 AD | Casey, Denis | Thesis | | |
| The 'Annals of Clonmacnoise (1627) as a translation and an early modern history | Casey, Denis | Article in Journal | | 2023 |
| The hagiographer and the law in early medieval Ireland | Casey, Denis | Article in Book | NA | 2006 |
| The Nugents of Westmeath and Queen Elizabeth's Irish primer | Casey, Denis | Monograph or Collective Volume | Four Courts | 2016 |
| Theobald MacGhee and the founding of Portmagee Village (c.1720AD) | Casey, Denis | Article in Journal | | 2024 |
| Tigernán Ua Ruairc and a twelfth-century royal grant in the Book of Kells | Casey, Denis | Monograph or Collective Volume | Four Courts Press | 2020 |
| Tigernán Ua Ruairc and a Twelfth-Century Royal Grant in the Book of Kells | Casey, Denis | Monograph or Collective Volume | Four Courts | 2020 |
| Tigernán Ua Ruairc and the Book of Kells | Casey, Denis | Article in Book | | 2013 |