John Metcalfe (16 May 1901 – 7 February 1982) was an Australian librarian, educator and author.
He was the Principal Librarian at the Public Library of New South Wales (now State Library of New South Wales) from 1942 until 1958 and University Librarian at the University of New South Wales from 1959–1966.
He was involved in the establishment and development of the Australian Institute of Librarians (AIL), the Free Library Movement and education for librarianship in Australia.