| Ross Island: mining, metal and society in early Ireland W O'Brien National University of Ireland, 2004 | 202 | 2004 |
| Prehistoric copper mining in Europe: 5500-500 BC W O'Brien Oxford University Press, USA, 2015 | 172 | 2015 |
| Mount Gabriel: bronze age mining in Ireland W O'Brien, A Brindley Galway University Press, 1994 | 122 | 1994 |
| Sacred ground: megalithic tombs in coastal south-west Ireland W O'Brien, T Mighall Department of Archaeology, National University of Ireland, Galway, 1999 | 86 | 1999 |
| William O'Brien and the course of Irish politics, 1881-1918 JV O'Brien Joseph Valentine O'Brien, 1976 | 73 | 1976 |
| Hillforts, warfare and society in Bronze Age Ireland W O'Brien, J O'Driscoll Archaeopress, 2017 | 62 | 2017 |
| Recollections W O'Brien New York: Macmillan, 1905 | 56 | 1905 |
| Ross Island and the origins of Irish-British metallurgy W O’Brien Ireland in the Bronze Age. Proceedings of the Dublin conference, 38-48, 1995 | 55 | 1995 |
| Prehistoric copper mining in south-west Ireland: the Mount Gabriel-type mines WF O'Brien Proceedings of the Prehistoric Society 56, 269-290, 1990 | 45 | 1990 |
| The Chalcolithic in Ireland: a chronological and cultural framework W O’Brien Is there a British Chalcolithic, 211-25, 2012 | 44 | 2012 |
| Vegetation change during the Mesolithic and Neolithic on the Mizen Peninsula, Co. Cork, south-west Ireland TM Mighall, S Timpany, JJ Blackford, JB Innes, CE O’Brien, W O’Brien, ... Vegetation History and Archaeobotany 17, 617-628, 2008 | 38 | 2008 |
| Iverni: a prehistory of Cork W O'Brien Collins, 2012 | 36 | 2012 |
| Megaliths in a mythologised landscape: south-west Ireland in the Iron Age W O’brien Monuments and landscape in Atlantic Europe, 152-176, 2005 | 35 | 2005 |
| Aspects of wedge tomb chronology W O’Brien Past perceptions: the prehistoric archaeology of south-west Ireland, 63-74, 1993 | 34 | 1993 |
| Local worlds: early settlement landscapes and upland farming in south-west Ireland W O'Brien, M Comber Collins Press, 2009 | 33 | 2009 |
| The Irish revolution and how it came about W O'Brien G. Allen & Unwin, Limited & Roberts, 1923 | 31 | 1923 |
| The dating of the Mt Gabriel-type copper mines of West Cork WF O'Brien Journal of the Cork Historical and Archaeological Society 92 (251), 50-70, 1987 | 30 | 1987 |
| Ross Island (bronze age studies 5) W O’Brien Galway: National University of Ireland, 2004 | 28 | 2004 |
| Lead isotopes and metal circulation in beaker/early bronze age Ireland JPN Northover, W O'Brien, S Stos The Journal of Irish Archaeology, 25-47, 2001 | 28 | 2001 |
| Bronze Age Coppermining in Europe W O’Brien | 27 | 2013 |
