| A courtly poem for Sir Richard Cox | | Article in Journal | | 1945 |
| A life on the rocks | O'Sullivan, Donal | Article in Book | | 2013 |
| A rebel R.I.C. constable from Kerry | O'Sullivan, Donal J. | Article in Journal | | 2007 |
| An expert's view of mill stones | O'Sullivan, Donal J. | Article in Journal | | 2004 |
| An insight into the life of an R.I.C. district inspector at Listowel in 1901 | O'Sullivan, Donal | Article in Journal | | 1997 |
| Carolan : the life and times of an Irish harper. 2 vols. | O'Sullivan, Donal | Monograph or Collective Volume | Routledge & Kegan Paul | 1958 |
| Carolan's skull | O'Sullivan, Donal | Article in Journal | | 1945 |
| Charles Dickens and Thomas Moore | O'Sullivan, Donal | Article in Journal | | 1948 |
| Church of St. John the Evangelist, Ashe Street, Tralee | O'Sullivan, Donal J. | Monograph or Collective Volume | | 2001 |
| Dublin Bay : a century of sailing 1884-1984 | O'Sullivan, Donal | Monograph or Collective Volume | Dublin Bay Sailing Club | 1984 |
| Dublin slang songs, with music | O'Sullivan, Donal | Article in Journal | | 1938 |
| Education in County Kerry in the 1830s | O'Sullivan, Donal | Article in Journal | | 2014 |
| Fr. John Crowley : padre of the desert | O'Sullivan, Donal J. | Article in Journal | | 2001 |
| Irish folk music, song, and dance | O'Sullivan, Donal | Monograph or Collective Volume | [s.n.] | 1969 |
| James Franklin Fuller - Kerry's great architect of the late 19th century | O'Sullivan, Donal | Article in Journal | | 2013 |
| John L. Sullivan, world boxing champion : his connection with Abbeydorney | O'Sullivan, Donal J. | Article in Journal | | 2011 |
| John O'Donovan - Commissioner of New Zealand Police | O'Sullivan, Donal J. | Article in Journal | | 2010 |
| Kerry's Tenuous connection with the foundation of the Gaelic Athletic Association | O'Sullivan, Donal J. | Article in Journal | | 2010 |
| Kingston's Mill - a reminiscence of five years spent milling near Rossmore | O'Sullivan, Donal J. | Article in Journal | | 2007 |
| Laying the Atlantic cable | O'Sullivan, Donal | Article in Journal | | 2000 |
| Lord Kenmare's century old hydro station on the Deenagh river gets a new lease of life | O'Sullivan, Donal J. | Article in Journal | | 1999 |
| Music in the National Library of Ireland | O'Sullivan, Donal | Article in Book | | 1952 |
| Obvervations on Michael Collins with an account of his funeral | Collins, John T. | Article in Journal | | 2013 |
| Queen Victoria's record of her visit to Killarney during August 1861 | | Article in Journal | | 1999 |
| Richard "The Boss" Croker | O'Sullivan, Donal J. | Article in Journal | | 2010 |
| Songs of the Irish : an anthology of Irish music and poetry with English verse translations | | Monograph or Collective Volume | Browne and Nolan | 1960 |
| Thaddaeus Connellan and his books of Irish poetry | O'Sullivan, Donal | Article in Journal | | 1941 |
| Thaddeus Connellan and his books of Irish poetry | O'Sullivan, Donal | Article in Journal | | 1942 |
| The big faction fight at Ballygurteen | O'Sullivan, Donal J. | Article in Journal | | 2009 |
| The Bunting collection of Irish folk music and songs; Part 1 & 2 | | Article in Journal | | 1930 |
| The Depot : a history of the Garda Síochána Depot at the Phoenix Park, Dublin | O'Sullivan, Donal J. | Monograph or Collective Volume | Navillus Publishing | 2007 |
| The development of policing in Killarney | O'Sullivan, Donal J. | Article in Book | | 2005 |
| The fate of John B. Kearney, district inspector of the R.I.C. and superintendent of the Civic Guard | O'Sullivan, Donal | Article in Journal | | 1998 |
| The grand tour of Ireland and Kerry's first motoring tourists of a century ago | O'Sullivan, Dónal J. | Article in Journal | | 2003 |
| The Harrington brothers and their Kerry connections | O'Sullivan, Donal J. | Article in Journal | | 2019 |
| The Irish constabularies 1822-1922 : a century of policing in Ireland | O'Sullivan, Donal J. | Monograph or Collective Volume | Brandon | 1999 |
| The Irish Free State and its Senate | O'Sullivan, Donal | Monograph or Collective Volume | Faber and Faber | 1940 |
| The music of Ireland | O'Sullivan, Donal | Article in Book | | 1953 |
| The Royal gunpowder mills, Ballincollig, Co. Cork | O'Sullivan, Donal | Article in Journal | | 2003 |
| The saddle and quern stones | O'Sullivan, Donal J. | Article in Journal | | 2002 |
| The Valentia Altazamuth Stone | O'Sullivan, Donal J. | Article in Journal | | 2005 |
| The Valentia tetrapod tracks | O'Sullivan, Donal | Article in Journal | | 2002 |
| The world's best-known Kerryman, Field-Marchall Horatio Herbert Kitchener | O'Sullivan, Donal J. | Article in Journal | | 2012 |
| Tralee Post Office | O'Sullivan, Donal J. | Article in Journal | | 2006 |
| Vertical or 'Roman' water wheels | O'Sullivan, Donal | Article in Journal | | 2002 |