Denis Oswald Jordan was an Anglo-Australian chemist with a distinguished career as a researcher and lecturer in Chemistry at both University College Nottingham (1940–53) and the University of Adelaide, where he was Angas Professor of Chemistry from 1958 to 1982. Jordan also served as president of Australian Institute of Nuclear Science and Engineering from 1958 to 1962, and Royal Australian Chemical Institute from 1978 to 1979.