• 

  Seán Ó Coileáin

  BA, MA(NUI 1966, 1967), AM(Harvard 1969), PhD(Harvard 1972) Emeritus Professor of Modern Irish, UCC Member, PL&A 2004
• 

  Noelle O Connell

  CEO European Movement Ireland
• 

  Dáibhí Iarla Ó Cróinín

  BA, MPhil, PhD(NUI) Chair of Historical Studies Committee Associate Professor of History, University of Galway Member, PL&A 1996
• 

  Colm Ó Cuaig

  Cúntóir Taighde, Foclóir Stairiúil na Gaeilge
• 

  Pól Ó Dochartaigh

  BA(Cardiff 1987), BA(Ulster 2004), PhD(Nottm 1995), DLitt(Nottm 2019), FRHistS, FHEA, FRSA. Deputy President and Registrar, University of Galway Member, PL&A 2010
• 

  Gearóid Ó Domagáin

  UU
• 

  Raghnall Ó Floinn

  BA, MA (NUI 1974, 1976), FSA Chair Historical Studies Committee Former Director, National Museum of Ireland Member, PL&A 2005
• 

  Cormac Ó Gráda

  MA, PhD Emeritus Professor of Economics, UCD Member, PL&A 1994
• 

  Liam Ó hAisibéil

  Ollscoil na Gaillimhe
• 

  Tadhg Pól Ó hAnnracháin

  BA(NUI 1984), MPhil(NUI 1986), PhD(EUI 1995) Professor, UCD Member, PL&A 2022
• 

  Ruairí Ó hUiginn

  BA, MA(NUI 1976, 1980), PhD(QUB 1989) Senior Professor, School of Celtic Studies, Dublin Institute for Advanced Studies Member, PL&A 2007
• 

  Rónán Ó Muirthile

  IADT
• 

  Eamonn Nollaig Ó Muraíle

  BA, MA, PhD(NUI 1970, 1971, 1991) Senior Lecturer in Modern Irish, University of Galway Member, PL&A 2009
• 

  Máirtín Ó Murchú

  MA(Dubl, NUI), PhD(NUI) Senior Professor of Celtic Studies, DIAS Member, PL&A 1988
• 

  Malachy Ó Néill

  Ollscoil Uladh
• 

  Gordon Ó Riain

  Ollscoil Luimnigh
• 

  Pádraig Seosamh Ó Riain

  MA, PhD Emeritus Professor of Early and Medieval Irish, Director of Locus Project, UCC Member, PL&A 1989
• 

  Michelle O Riordan

  DIAS
• 

  Iseult Ó Síocháin

  Deputy Executive Director, Programmes and Engagement
• 

  Niamh O'Boyle

  TCD
• 

  Maeve O'Brien

  Membership Manager, Digital Repository of Ireland
• 

  Fergal O'Brien

  BA, BAI( Dubl 1997), PhD(Dubl 2001) Professor of Tissue Engineering and Regenerative Medicine, RCSI Member, Science 2018
• 

  William Francis O'Brien

  BA, PhD(NUI 1982, 1987) Professor of Archaeology, UCC Member, PL&A 2008
• 

  Dáithí O'Ceallaigh

  BA(NUI 1966), H DIp Ed(NUI 1967), Dr Intl Rels hon(Geneva Sch Dip Intl Rels 2010), DPhil hon(Ulster 2017) Institute of International and European Affairs Member, PL&A 2019
• 

  Michael O'Connell

  BSc, PhD, DSc, HDipEd Professor of Botany (Personal Chair), University of Galway Member, Science 1996

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