| A prehistory of Kerry | O'Brien, William | Article in Book | | 2020 |
| A primitive mining complex at Derrycarhoon, county Cork | O'Brien, William | Article in Journal | | 1989 |
| Altar tomb and the prehistory of Mizen | O'Brien, William | Article in Journal | | 1993 |
| An olive branch in Ireland and its history | O'Brien, William | Monograph or Collective Volume | | 1910 |
| Archaeological investigations at Ballylin Hillfort, Co. Limerick | Hogan, NickO'Brien, WilliamO'Driscoll, James | Article in Journal | | 2016 |
| Archaeological investigations at Toor More (Corrandhu) Hillfort, Co. Kilkenny | Hogan, NickO'Brien, WilliamO'Driscoll, James | Article in Journal | | 2015 |
| Aspects of 'Fulacht Fiadh' function and chronology in Cork | O'Brien, William | Article in Journal | | 2012 |
| Boulder-burials : a later bronze age megalith tradition in south-west Ireland | O'Brien, William | Article in Journal | | 1992 |
| Bronze age copper mines at Callares Oughter and Carrigacat | O'Brien, William | Article in Journal | | 2003 |
| Bronze age copper mining at Boulyscillagh, Goleen | O'Brien, William | Article in Journal | | 2002 |
| Bronze age copper mining on Ballyrisode Hill | O'Brien, William | Article in Journal | | 2001 |
| Bronze age copper mining on Mount Gabriel | O'Brien, William | Article in Journal | | 1994 |
| Christmas on the Galtees | O'Brien, William | Monograph or Collective Volume | L. Cusack | 2010 |
| Clashanimud Hillfort and Bronze Age warfare in Cork | O'Brien, William | Article in Journal | | 2014 |
| Derrycarhoon: a bronze age copper mine in West Cork | Hogan, NickO'Brien, William | Article in Journal | | 2012 |
| Devoy's post bag, 1871-1928. Vol. 1, 1871-80; vol. 2, 1880-1928 | | Monograph or Collective Volume | Fallon | 1953 |
| Early industries in Killarney | Larner, JimO'Brien, William | Article in Book | | 2005 |
| Early metalworking and myth on the lakes of Killarney | O'Brien, William | Article in Book | | 2003 |
| Edmund Burke as an Irishman | O'Brien, William | Monograph or Collective Volume | | 1924 |
| Forth the banners go : reminiscences of William O'Brien, as told to Edward MacLysaght | O'Brien, William | Monograph or Collective Volume | Three Candles | 1969 |
| Garranes : an early medieval royal site in south-west Ireland | | Monograph or Collective Volume | Archaeopress | 2021 |
| Garret Fitzgerald and the Fine Gael party | O'Brien, William | Article in Book | | 1986 |
| Glanbane Hillfort and the bronze age in Kerry | Hogan, NickO'Brien, WilliamO'Driscoll, James | Article in Journal | | 2016 |
| Grattan's Home Rule, Gladstone's, and Asquith's | O'Brien, William | Monograph or Collective Volume | Free Press | 1915 |
| Hidden 'Celtic' Ireland : indigenous Iron Age settlements in the south-western peninsulas | O'Brien, William | Article in Book | | 2009 |
| Hillforts, warfare and society in Bronze Age Ireland | O'Brien, William, 1961-
O'Driscoll, James | Monograph or Collective Volume | Archaeopress | 2017 |
| Imagining Catholic Ireland : the nationalist press and the creation of national identity, 1843-1870 | O'Brien, William George | Thesis | | 2007 |
| Killarney in prehistoric times | O'Brien, William | Article in Book | | 2001 |
| Knockatreenane and the prehistoric barrows of county Cork | O'Brien, William | Article in Journal | | 2010 |
| Lisnamanroe and the early medieval 'royal site' at Garranes, Co. Cork | Hogan, NickO'Brien, William | Article in Journal | | 2020 |
| Local worlds : early settlement landscapes and upland farming in south-west Ireland | O'Brien, William | Monograph or Collective Volume | Collins Press | 2009 |
| Megalithic tombs, metal resources and territory in prehistoric south-west Ireland | O'Brien, William | Article in Book | | 2000 |
| Mount Gabriel : Bronze Age mining in Ireland | Brindley, AnnaChambert, FrankIxer, Robert A.Lanting, JanMcKeown, SandraMighall, TimO'Brien, William | Monograph or Collective Volume | Galway University Press | 1994 |
| Our mining past : the metal-mining heritage of Cork | O'Brien, William | Monograph or Collective Volume | Cork Public Museum | 1994 |
| Prehistoric Copper Mining in Europe 5500-500 BC | O'Brien, William | Monograph or Collective Volume | Oxford University Press | 2015 |
| Prehistoric copper mining in south-west Ireland : the Mount-Gabriel type mines | O'Brien, William | Article in Journal | | 1990 |
| Ross Island - the beginning | O'Brien, William | Article in Journal | | 1995 |
| Ross Island : mining metal and society in early Ireland | O'Brien, William | Monograph or Collective Volume | National University of Ireland | 2004 |
| Sacred ground : megalithic tombs in coastal south-west Ireland | O'Brien, William | Monograph or Collective Volume | National University of Ireland | 1999 |
| The Bronze age copper mines of the Goleen area, Co. Cork | O'Brien, William | Article in Journal | | 2003 |
| The dating of the Mt Gabriel-type copper mines of West Cork | O'Brien, William | Article in Journal | | 1987 |
| The development of the hillfort in prehistoric Ireland | O'Brien, William | Article in Journal | | 2017 |
| The Irish revolution and how it came about | O'Brien, William | Monograph or Collective Volume | Maunsel and Roberts | 1923 |
| The Parnell of real life | O'Brien, William | Monograph or Collective Volume | | 1926 |
| Toor More (Corrandhu): a bronze age hillfort in North Kilkenny | O'Brien, William | Article in Journal | | 2017 |