| 'Sloinnteoireacht': John Lyne's collection of Sliabh Luachra genealogies | Ó Canann, Tomás G. | Article in Journal | | 2008 |
| A historical note on Baile Uí Chanann | Ó Canann, Tomás | Article in Journal | | 2017 |
| A pair of toponyms from Clann Mhic Giolla Dhé | Ó Canann, Tomás | Article in Journal | | 1994 |
| A poem on the rights of the coarb of Saint Molaisse | Ó Canann, Tomás G. | Article in Journal | | 1994 |
| Aspects of an early Irish surname : Ua Canannáin | Ó Canann, Tomás G. | Article in Journal | | 1993 |
| Aspects of the history of Clann tSuibhne | Ó Canann, Tomás | Article in Journal | | 2018 |
| Áth Uí Chanannáin and the toponomy of medieval Mide | Ó Canann, Tomás G. | Article in Journal | | 1992 |
| Biographical note : Father Bryan O'Cannan (1692-1743) | Ó Canann, Tomás | Article in Journal | | 2000 |
| Carraig an Dúnáin : probable Ua Canannáin inauguration site | Ó Canann, Tomás | Article in Journal | | 2003 |
| Clann Fhiangusa and the pedigree of Flann mac Máile Dúin | Ó Canann, Tomás G. | Article in Journal | | 2004 |
| Conall mac Mhícheáil Uí Bhréisléin of Glengesh: Last Hereditary Keeper of Bearnán Conaill | Ó Canann, Tomás G. | Article in Journal | | 2024 |
| Dynastic conflict in medieval Donegal, AD 800-1400 | Ó Canann, Tomás G. | Article in Book | | 2013 |
| Edmund Hogan : editor and scholar | Ó Canann, Tomás G. | Article in Book | | 2011 |
| Fragmenta Rapotensiana : contributions towards a diocesan dictionary | Ó Canann, Tomás G. | Article in Journal | | 1996 |
| Fragmenta Rapotensiana : contributions towards a diocesan dictionary | Ó Canann, Tomás | Article in Journal | | 1996 |
| Gaelic surnames and settlement patterns in southwest Donegal 1659-1857 | Ó Canann, Tomás G. | Article in Journal | | 2020 |
| Gildeas lament : a folksong of emigration | Ó Canann, Tomás G. | Article in Journal | | 1993 |
| Historical note of the medieval territory of Glean Néimhthihne | Ó Canann, Tomás G. | Article in Journal | | 2000 |
| Historical note on the medieval territory of Gleann Néimhthinne | Ó Canann, Tomás G. | Article in Journal | | 1996 |
| Máel Coba Ua Gallchobair and his early family background | Ó Canann, Tomás G. | Article in Journal | | 2004 |
| Méig Bhuirrce and the origin of Clann tSuibhne in Scotland and Ireland | Ó Canann, Tomás G. | Article in Journal | | 2019 |
| Notes on medieval Donegal [I]|Notes on medieval Donegal II|Notes on medieval Donegal III | Ó Canann, Tomás G. | Article in Journal | | 2016 |
| Notes on some Donegal place-names | Ó Canann, Tomás | Article in Journal | | 1989 |
| Ó Domhnaill's inauguration, according to Pilib Ó Súilleabháin Bhéarra | Ó Canann, Tomás G. | Article in Journal | | 2007 |
| Review article | Ó Canann, Tomás | Article in Journal | | 2002 |
| Roger O Ferrall, his family background and 'Linea Antiqua' | Ó Canann, Tomás | Article in Journal | | 2012 |
| Sliocht Cormaic Mhic Carthaigh, Dúna Goill | Ó Canann, Tomás G. | Article in Journal | | 2003 |
| Surveying County Donegal | Ó Canann, Tomás G. | Article in Journal | | 2009 |
| The Annals of Inisfallen: an independent witness to northern events | Ó Canann, Tomás | Article in Journal | | 2008 |
| The emergence of 'Muintir Chanannáín' in early medieval Donegal | Ó Canann, Tomás G. | Article in Journal | | 2022 |
| The origin of the Donegal surname 'Mac Giolladhe' | Ó Canann, Tomás | Article in Journal | | 1988 |
| The political context of the prose A version of Immram Snédgusa and Mac Raigla | Ó Canann, Tomás | Article in Journal | | 2005 |
| Trí Saorthuatha Mhuinntire Chanannáin : a forgotten medieval placename | Ó Canann, Tomás | Article in Journal | | 1986 |
| Ua Canannáin genealogies in the Irish manuscript tradition | Ó Canann, Tomás G. | Article in Journal | | 1999 |