Mad Jack the Pirate is an American animated comedy-adventure television series. The show was created by Bill Kopp and was directed by Jeff DeGrandis (who previously worked together on Toonsylvania). On American television, the show was broadcast on Fox Kids.

The show is about the rather unsuccessful and quite cowardly Pirate Jack (voiced by Bill Kopp), who despite his repeated failures never doubts his own excellence, and his dim-witted anthropomorphic rat sidekick Snuk (voiced by Billy West) as they sail the seas on their ship the Sea Chicken.

Critics have noted that the clear inspiration for the show is the 1983-1989 BBC comedy series Blackadder. Jack bears a striking resemblance to Edmund Blackadder and Snuk to Baldrick. There is even some dialogue taken straight from the BBC series. Jack's archenemy Flash resembles Blackadder's Lord Flashheart, and Angus is almost identical to Blackadder's Lord Angus.

The series has been released on DVD in Romania (as Piratul Jack cel Teribil) and Bulgaria (as Пиратът Капитан Джак) and on VCD in Turkey (under the title Çılgın Korsan Jack). Also in Turkey, the cartoon was shown on Jetix Play and in Poland on Fox Kids.

Ownership of the series passed to Disney in 2001 when Disney acquired Fox Kids Worldwide, which also includes Saban Entertainment.