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Aubrey Osborn Gwynn (1892 – 18 May 1983) was an Irish Jesuit historian.
He came from a Protestant academic family, the son of Stephen Gwynn and the grandson of John Gwynn, professor of theology at Trinity College Dublin. Gwynn converted to Roman Catholicism at age 10, when his mother was received into the Catholic Church. He attended the Jesuit-run Clongowes Wood College from 1903 to 1908. A watercolour portrait of him as a child by his godfather Walter Osborne is in the collection of the National Gallery of Ireland.
Gwynn was professor of medieval history at University College Dublin and President of the Royal Irish Academy (1958–1961). His brother Denis Rolleston Gwynn (1893–1971) was professor of modern Irish history at University College, Cork.
- Roman Education from Cicero to Quintilian (1926)
- The English Austin Friars in the Time of Wyclif (1940)
- The Medieval Province of Armagh, 1470-1545 (1946)
- The Writings of Bishop Patrick 1074-1084 (1955)
- Medieval Religious Houses: Ireland (1970) with R. N. Hadcock
- The Irish Church in the Eleventh and Twelfth Centuries, edited by Gerard O'Brien
- Twelfth Century Reform (A History of Irish Catholicism II) (1968)
- Anglo-Irish Church Life: Fourteenth and Fifteenth Centuries (A History of Irish Catholicism) 1968
- Aubrey Gwynn, Cathal Óg mac Maghnusa and the Annals of Ulster (1998 reprint), edited by Nollaig Ó Muraíle
- Hugh Kearney, Ireland: Contested Ideas of Nationalism and History (2007), p. 15.