William Owen Chadwick OM KBE FBA FRSE, was a British Anglican priest, academic, rugby international, writer and prominent historian of Christianity. As a leading academic, Chadwick became Dixie Professor of Ecclesiastical History from 1958 to 1968 and Regius Professor of History from 1968 to 1983. From 1956 to 1983, Chadwick was elected and served as the Master of Selwyn College, Cambridge. In his obituaries, Chadwick was described as "one of the great religious historians of our time" by The Independent, and as "one of the most remarkable men of letters of the 20th century" by The Guardian.