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] He was elected a fellow of the British Academy in 1976.^[3][4]