William Campion

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