Gilligan's Planet is an American Saturday morning animated series produced by Filmation and MGM/UA Television which aired during the 1982–1983 season on CBS. It was the second animated spin-off of the sitcom Gilligan's Island (the first being The New Adventures of Gilligan).

Gilligan's Planet was the last cartoon series that Filmation produced for Saturday mornings; afterwards, they transitioned from Saturday mornings to producing cartoons exclusively for syndication. It was also the first Filmation series to feature the Lou Scheimer "signature" credit (as opposed to the rotating Lou Scheimer/Norm Prescott "wheel" credit which had been used since 1969). In addition, it was one of the last 1980s Saturday morning cartoons to be fitted with an adult laugh track, as the popularity of the practice had subsided.

Gilligan's Planet featured all of the original actors but one; Tina Louise, who has consistently refused to participate in any Gilligan's Island-related material since the series ended, again declined to reprise her role as Ginger Grant, who again was portrayed as a platinum blonde (as was the case in The New Adventures) instead of Louise's red hair. Dawn Wells, who had been unavailable during the production of The New Adventures of Gilligan, returned to the franchise, voicing both her own character (Mary Ann Summers) and Ginger. Gilligan's Planet would also be the final time that Backus and Hale would portray their respective characters, Mr Howell and the Skipper before their deaths in 1989 and 1990 respectively.