"Spookyfish" is the fifteenth episode of the second season of the American animated television series South Park. The 28th episode of the series overall, it originally aired on Comedy Central in the United States on October 28, 1998. The episode was written and directed by series co-creator Trey Parker. In the episode, Aunt Flo comes to stay, but her goldfish she bought for Stan Marsh turns out to be evil. Also "Cartman" grows a beard and starts acting strangely nice and agreeable. It was the season's Halloween special, featuring the "spooky" theme of having pictures of Barbra Streisand in the screen corners, accompanied with the words "Spooky Vision".

The second season of South Park, an American animated television series created by Trey Parker and Matt Stone, began airing on April 1, 1998. The second season concluded after 18 episodes on January 20, 1999; it remains the longest season of South Park to date. Almost all the episodes were directed by series co-creator Trey Parker, with the exception of two episodes directed by Eric Stough.