Jack Black (born 1969) is an American actor and singer from Tenacious D. Jack Black may also refer to: Jack Black (author) (1871–1932), author and hobo Jack Black (rat catcher), Victorian-era rat catcher Jack Black (Viz), a character in the adult comic Viz Jack Black (died 1786), nickname of black Welsh gardener John Ystumllyn See also John Black (disambiguation) Black Jack (disambiguation) Black (disambiguation) Jack (disambiguation)