Roger Sherman Loomis (October 31, 1887 – October 11, 1966) was an Arthurian scholar notable for his work tracing the myth's Celtic origins.
- Celtic Myth and Arthurian Romance (1927)
- The Romance of Tristram and Ysolt (1931) translator
- Arthurian Legends in Medieval Art (1938) with Laura Hibbard Loomis
- Arthurian Tradition And Chretien De Troyes (1949)
- Wales and the Arthurian Legend (1956)
- Arthurian Literature in the Middle Ages, A Collaborative History (1959) editor
- The Grail: From Celtic Myth to Christian Symbol (1963)
- The Development of Arthurian Romance (1963)
- Loomis, Roger Sherman (Ed.). (1959). Arthurian Literature in the Middle Ages: A collaborative history. Oxford: Clarendon Press. ISBN 0-19-811588-1
- Loomis, Roger Sherman (1960). A survey of Tristan scholarship after 1911. In Gertrude Schoepperle Loomis, Tristan and Isolt: A study of the sources of the romance (2nd edition, pp. 565–87). New York: Burt Franklin.
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