John Claud Trewinard Oates FBA (24 June 1912 – 11 June 1990)[1][2] was a librarian at the University of Cambridge, a trustee of the university, and president of the Bibliographical Society (1970–72).
He was educated at The Crypt School, Gloucester, and Trinity College, Cambridge, graduating in 1935.
He became assistant under-librarian at Cambridge University Library a year later, was promoted to under-librarian in 1949, deputy librarian in 1975, and finally became acting chief librarian in 1979, a year before his retirement.
He was also Reader (later Emeritus) in Historical Bibliography at Cambridge, and a fellow of Darwin College.
[1] In 1952 he held the Sandars Readership in Bibliography speaking on "A History of the Collection of Incunabula in the Cambridge University Library, and again in 1965 on "Abraham Whelock (1593–1653): Orientalist, Anglo-Saxonist and University Librarian."