John Blyth Barrymore III (born May 15, 1954) is an American film and television actor.

[2] He is of partial Irish descent through his great-grandfather, actor Maurice Costello.

John has stated that he does not remember if he met his aunt Diana Barrymore, who was also an actress.

[3] Like his father, John has had a sporadic career in film and television, mainly appearing in shock horror movies and comedies.

While on skid row, he took to wearing a shirt printed "I'm Drew Barrymore's brother".