Scooby-Doo on Zombie Island is a 1998 direct-to-video animated comedy horror film based on Hanna-Barbera's Scooby-Doo Saturday-morning cartoons. In the film, Shaggy, Scooby, Fred, Velma, and Daphne reunite after a year-long hiatus from Mystery, Inc. to investigate a bayou island said to be haunted by the ghost of the pirate Morgan Moonscar. The film was directed by Jim Stenstrum, from a screenplay by Glenn Leopold.

Popularity for Scooby-Doo had grown in the 1990s due to reruns aired on Cartoon Network. The channel's parent company, Time Warner, suggested developing a direct-to-video (DTV) film on the property. The team at Hanna-Barbera consisted of many veteran artists and writers. Much of the original voice actors of the series were recast for the film, although Frank Welker returned to voice Fred Jones. It was also the first of four Scooby-Doo direct-to-video films to be animated overseas by Japanese animation studio Mook Animation. Rock bands Third Eye Blind and Skycycle contribute to the soundtrack.

Zombie Island contains a darker tone than most Scooby-Doo productions, and is notable for containing real supernatural creatures rather than people in costumes. The film was released on September 22, 1998, and received positive reviews from critics, who complimented its animation and story. The film was aided by a $50 million promotional campaign, and sponsorship deals with multiple companies. Sales of the film on VHS were high, and it became the first in a long-running series of DTV Scooby-Doo films.

Two decades after the film's release, Warner Bros Animation developed a sequel, Return to Zombie Island, released in 2019.

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