William Campion may refer to: William Campion (governor), British MP for Lewes and governor of Western Australia William Campion (died 1615) (1549–1615), MP for Haslemere William Campion (mathematician) (1820–1896), mathematician and president of Queens' College, Cambridge William Campion (Jesuit) (1599–1665), English Jesuit William Campion (organist), organist of Chichester Cathedral William Campion (1640–1702), MP for Kent Bill Campion (born 1952), American basketball player SS William Campion, the name for SS Oakmar while in service with the Garland Steamship Corporation