| 'Politics and that girl' : a study of William Orpen's 'Sowing New Seed in the Department of Agriculture and Technical Instruction for Ireland' | McConkey, Kenneth | Article in Book | | 2005 |
| A celebration of William Orpen | | Article in Journal | | 2019 |
| An Irish doctor's odyssey : The saints are in heaven ; selected memories of an Irish doctor abroad | Colbert, Dom | Monograph or Collective Volume | Orpen Press | 2018 |
| An Orpen attributed: Sir William Orpen and the Dalhousie Hospital in France | Grace, Pierce A.Leddin, Desmond | Article in Journal | | 2019 |
| An unpublished letter from Charles I to the marquis of Ormonde | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1921 |
| Art and uncertainty : painting in Ireland, 1912-1932 | Kennedy, Róisín | Article in Book | | 2016 |
| Athlone Castle : its early history, with notes on some neighbouring castles | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1907 |
| Castrum Keyvini : Castlekevin | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1908 |
| Charters of Earl Richard Marshall of the forests of Ross and Taghmon | | Article in Journal | | 1934 |
| Church of St. John the Evangelist, Ashe Street, Tralee | O'Sullivan, Donal J. | Monograph or Collective Volume | | 2001 |
| Comedy's ill-fated muse | Pyle, Hillary | Article in Journal | | 2014 |
| Darling Margaret : A look at Orpen's favourite pupil | Pyle, Hilary | Article in Journal | | 2007 |
| Deaf records | Fitzsimons, Fiona | Article in Journal | | 2017 |
| Dundrum Castle, County Down, identified with the 'Castrum de Rath' | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1909 |
| Emulation and legacy : the master-pupil relationship between William Orpen and Seán Keating | O'Connor, Éimear | Article in Book | | 2013 |
| Historical revisit : Goddard Henry Orpen, Ireland under the Normans, 1169-1333 (1911-20) | Duffy, Seán | Article in Journal | | 2000 |
| Ireland to 1315 | Orpen, G. H. (Goddard Henry) | Article in Book | | 1932 |
| Ireland under the Normans, 1169-1333 | Duffy, SeánOrpen, G. H. (Goddard Henry) | Monograph or Collective Volume | Four Courts | 2005 |
| Ireland under the Normans, vols. 1-2 : 1169-1216; vols. 3-4 : 1216-1333. 4 vols. | Orpen, G. H. (Goddard Henry) | Monograph or Collective Volume | | 1911 |
| Ireland, 1315-c.1485 | Orpen, G. H. (Goddard Henry) | Article in Book | | 1936 |
| Land tenure in Kenmare and Tuosist, 1696-c.1716, with notes on the tenants and their holdings | Lyne, G. J. | Article in Journal | | 1977 |
| Love and beauty in an age of extremes | Upstone, Robert | Article in Book | | 2005 |
| Marian Finucane : the Saturday interviews, 2005-2011 | Finucane, Marian | Monograph or Collective Volume | Orpen Press | 2011 |
| Monksgrange : the home of Mr and Mrs Richards-Orpen | O'Callaghan, John | Article in Journal | | 1968 |
| Mote and bretesche building in Ireland | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1906 |
| Motes and Norman castles in Ireland. Parts 1-2 | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1907 |
| Motes and Norman castles in Ossory | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1909 |
| New Ross in the thirteenth century : an address delivered before the New Ross Literary Society | Orpen, G. H. (Goddard Henry) | Monograph or Collective Volume | | 1911 |
| No tears left : Biafra to Bosnia ; Further memoirs of an Irish doctor abroad | Colbert, Dom | Monograph or Collective Volume | Orpen Press | 2018 |
| Notes on the Bermingham pedigree | Orpen, Goddard H. | Article in Journal | | 1915 |
| Novum Castrum McKynegan, Newcastle, County Wicklow | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1908 |
| Orpen | Arnold, Bruce | Article in Journal | | 1995 |
| Orpen : Mirror to an Age | Arnold, Bruce, 1936- | Monograph or Collective Volume | | 1981 |
| Orpen and the new Ireland | Foster, R. F. (Robert Fitzroy) (Roy), 1949- | Article in Book | | 2005 |
| Orpen v. MacNeill: writing Anglo-Norman Ireland in the revolutionary decade | Cullen, Ruairí | Article in Journal | | 2019 |
| Orpen, Ibsen and the plays within the play | Jenkins, David Fraser | Article in Book | | 2005 |
| Poet, madman, scoundrel : 189 unusual Irish lives | Slattery, David | Monograph or Collective Volume | Orpen | 2012 |
| Ptolemy's map of Ireland | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1894 |
| Re-fighting the battle of Down : Orpen, MacNeill and the Irish nation-state | Harrison, Stephen H. | Article in Book | | 2000 |
| Richard de Burgh and the conquest of Connaught | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1911 |
| Some Irish Cistercian documents | | Article in Journal | | 1913 |
| Some men and a picture | McConkey, Kenneth | Article in Book | | 1998 |
| Song of Dermot and the earl, an old French poem | | Monograph or Collective Volume | | 1892 |
| Strip farms in the Graiguenamanagh basin | Richards-Orpen, J. | Article in Journal | | 1946 |
| The avenue : a history of the Claremont Institution | Pollard, Rachel | Monograph or Collective Volume | Denzille Press | 2006 |
| The battle of Dundonell (Baginbun), A.D. 1170 | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1904 |
| The castle of Raymond le Gros at Fodredunolan | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1906 |
| The challenge of change : putting patients before providers | Drumm, Brendan | Monograph or Collective Volume | Orpen Press | 2011 |
| The complete guide to the statues and sculptures of Dublin city | Doherty, Noel | Monograph or Collective Volume | Orpen | 2015 |
| The earldom of Ulster | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1921 |
| The effects of Norman rule in Ireland, 1169-1333 | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1914 |
| The effects of Norman rule in Ireland, 1169-1333 | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1913 |
| The Extraordinary Story of Mary Elmes: The Irish Oskar Schindler | Butler, Paddy | Monograph or Collective Volume | Orpen Press | 2017 |
| The Fitz Geralds, barons of Offaly | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1914 |
| The Normans in Tirowen and Tirconnell | Orpen, G. H. (Goddard Henry) | Article in Journal | | 1915 |
| The Orpen project | | Article in Journal | | 2015 |
| The road from Castlebarnagh: growing up in Irish music, a memoir | O'Brien, Paddy | Monograph or Collective Volume | Orpen Press | 2012 |
| The Scandinavian inroads and the movement towards Rome | Orpen, G. H. (Goddard Henry) | Article in Book | | 1934 |
| When words are not enough | Maguire, Donal | Article in Journal | | 2005 |
| William Orpen | Barrow, Viola | Article in Journal | | 1982 |
| William Orpen : an onlooker in France : a critical edition of the artist's war memories | Orpen, William, Sir, 1878-1931 | Monograph or Collective Volume | Paul Holberton | 2008 |
| William Orpen : politics, sex and death | Foster, R. F. (Robert Fitzroy) (Roy), 1949-Jenkins, DavidUpstone, Robert | Monograph or Collective Volume | Imperial War Museum | 2005 |
| William Orpen as student and teacher | Turpin, John | Article in Journal | | 1979 |
| William Orpen's war | McConkey, Kenneth | Article in Journal | | 2014 |