Roy S. Simmonds (September 16, 1925 – November 10, 2001) was an English literary scholar and critic best known for his biographies of John Steinbeck, William March and Edward O'Brien.

Works The Two Worlds of William March (1984).Ball State University Library "Roy S. Simmonds papers" William March: An Annotated Checklist (1989).Hayashi, Tetsumaro "Tribute to Roy S. Simmonds" John Steinbeck: The War Years, 1939-1945 (1996).Amazon "author's publication list" A Biographical and Critical Introduction of John Steinbeck (2000). Edward J. O’Brien and His Role in the Rise of the American Short Story in the 1920s and 1930s (2001).

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