| 'Better remain in our ignorance' | Ryan, John | Article in Book | | 2016 |
| A centenary and a golden jubilee : Mother Morrogh Bernard and the Providence Woollen Mills [Foxford] 1842-1892-1942 | Ryan, John | Article in Journal | | 1942 |
| A difficult phrase in the 'Confession' of St. Patrick | Ryan, John | Article in Journal | | 1938 |
| An Tráchtáil in Éirinn na sean-aimsire | Ryan, John | Article in Journal | | 1942 |
| Augustinian religious houses at Buttevant and Crossmolina | Ryan, John | Article in Journal | | 1941 |
| Brian Borumha, King of Ireland | Ryan, John | Article in Book | | 1967 |
| Clonmacnoise : a historical summary | Ryan, John | Monograph or Collective Volume | The Stationery Office | 1976 |
| Deer forests, game shooting and landed estates in the south-west of Ireland, 1840-1970 | Ryan, John Mathias | Thesis | | 2001 |
| Dom Louis Gougaud, O. S. B. | Ryan, John | Article in Journal | | 1941 |
| Donnchadh Ruadh Mac Conmara: the first Banner hurler to play for the Déise! | Ryan, John | Article in Journal | | 2019 |
| Early Irish-German associations | Ryan, John | Article in Journal | | 1969 |
| Ecclesiastical relations between Ireland and England in the seventh and eighth centuries : St. Berchert of Tullylease | Ryan, John | Article in Journal | | 1938 |
| Eoin Mac Neill, 1867-1945 : professor of early Irish history, University College, Dublin | Ryan, John | Article in Journal | | 1945 |
| Féil-sgríbhinn Eóin Mhic Neill | Ryan, John | Monograph or Collective Volume | Four Courts | 1995 |
| Gerald O'Donovan : priest, novelist and nation-builder | Ryan, John | Article in Book | | 2003 |
| Gerald O'Donovan, priest, novelist, intellectual: a forgotten leader of the Irish revival | Ryan, John Francis | Thesis | | 1984 |
| Gerald O'Donovan: A Life: 1871-1942 | Ryan, John F. | Monograph or Collective Volume | Liverpool University Press | 2022 |
| Gerald O’Donovan : priest, novelist, and Irish revivalist | Ryan, John F. | Article in Journal | | 1996 |
| Ireland's presidency of the United Nations Security Council in August 1982 | Ryan, Johnny | Article in Journal | | 2003 |
| Irish learning in the seventh century | Ryan, John | Article in Journal | | 1950 |
| Irish monasticism : origins and early development | Ryan, John | Monograph or Collective Volume | Irish University Press | 1972 |
| Irish monasticism : origins and early development | Ryan, John | Monograph or Collective Volume | | 1931 |
| Irish monasticism : origins and early development | Ryan, John | Monograph or Collective Volume | Four Courts | 1992 |
| Irish monks in the Golden Age | | Monograph or Collective Volume | | 1963 |
| Irish whiskey | Ryan, John Clement | Monograph or Collective Volume | Eason & Son | 1992 |
| Knights errant | Ryan, John | Article in Book | | 1998 |
| Les Irlandais en Écosse et en Angleterre | Ryan, John | Article in Book | | 1956 |
| Palladius agus Patricius | Ryan, John | Article in Journal | | 1942 |
| Pre-Norman Dublin | Ryan, John | Article in Book | | 1990 |
| Remembering how we stood : bohemian Dublin in the mid-century | Ryan, John | Monograph or Collective Volume | Gill & Macmillan | 1975 |
| Rudolf Thurneysen : 1857-1940 | Ryan, John | Article in Journal | | 1940 |
| Saint Patrick | | Monograph or Collective Volume | Stationery Office for Radio Éireann | 1958 |
| St Colmcille : the prince | Ryan, John | Article in Journal | | 1963 |
| St Columba of Derry and Iona | Ryan, John | Article in Journal | | 1963 |
| St Patrick : Bury versus Slemish : a Patrician problem | MacNeill, EoinRyan, John | Article in Book | | 1973 |
| St Patrick, apostle of Ireland | Ryan, John | Article in Journal | | 1961 |
| Studies in early Irish law | Binchy, D. A. (Daniel Anthony), 1900-1989Dillon, MylesKnoch, AugustMulchrone, KathleenPower, NancyRyan, JohnThurneysen, Rudolf | Monograph or Collective Volume | | 1936 |
| Studies in early Irish law | Binchy, D. A. (Daniel Anthony), 1900-1989Dillon, MylesKnoch, AugustMulchrone, KathleenPower, NancyRyan, JohnThurneysen, R. | Monograph or Collective Volume | Hodges Figgis|Williams & Norgate | 1936 |
| Teach Colmchille | Ryan, John | Article in Journal | | 1938 |
| The abbatial succession at Clonmacnois from the foundation of the monastery to the coming of the Norse (A.D. 545-799) | Ryan, John | Article in Book | | 1995 |
| The achievements of our Irish monks | Ryan, John | Article in Book | | 1963 |
| The ancestry of St Laurence O'Toole | Ryan, John | Article in Journal | | 1955 |
| The battle of Clontarf | Ryan, John | Article in Book | | 1964 |
| The convention of Druim Ceat (A.U. 575) | Ryan, John | Article in Journal | | 1946 |
| The Dalcassians | Ryan, John | Article in Journal | | 1943 |
| The early history of Leinster | Ryan, John, SJ | Article in Journal | | 1948 |
| The early Irish church and the see of Peter | Ryan, John | Article in Book | | 1961 |
| The falling world | Ryan, John | Article in Book | | 1963 |
| The garden at Heywood, Ballinakill, Co. Laois | Ryan, John A. | Article in Journal | | 1991 |
| The historical background | Ryan, John | Article in Book | | 1961 |
| The historical content of the 'Caithreim Ceallachain Chaisil' | Ryan, John | Article in Journal | | 1941 |
| The monastic institute | Ryan, John | Monograph or Collective Volume | Gill | 1972 |
| The O'Briens in Munster after Clontarf | Ryan, John | Article in Journal | | 1942 |
| The story of Saint Carthage, otherwise Saint Mochuda, 7th century | Carthage, Fr.Ryan, John | Monograph or Collective Volume | Browne and Nolan | 1937 |
| The traditional view | Ryan, John | Article in Book | | 1958 |
| The two Patricks | Ryan, JohnUa Riain, Eóin | Article in Journal | | 1942 |
| Toirdelbach Ó Conchubair (1088-1156), king of Connacht, king of Ireland co fresabra | Ryan, John | Monograph or Collective Volume | National University of Ireland | 1966 |
| Two and fifty Irish saints | Carty, FrancisRyan, John | Monograph or Collective Volume | Duffy | 1941 |
| William Thomas Mulvany | Ryan, John | Article in Journal | | 1923 |