"The Legend of Boo-Kini Bottom" is the fourth episode of the eleventh season, and the 220th overall episode of the American animated television series SpongeBob SquarePants. It originally aired on Nickelodeon in the United States on October 13, 2017. In this episode, the Flying Dutchman wants to make sure SpongeBob and his friends are scared on Halloween. It is the second SpongeBob episode to be animated through stop-motion instead of the usual 2D format following "It's a SpongeBob Christmas!".

The episode's stop-motion animation was produced at Screen Novelties (returning from "It's a SpongeBob Christmas!") and was directed by Mark Caballero and Seamus Walsh, two of the founders of the company. The animation style was inspired by those of the classic Rankin/Bass television specials. The episode is written by Mr. Lawrence and features an original song, "The Scare Song," which was written by Lawrence with music by Eban Schletter. Sally Cruikshank designed the 2D animated sequence in the episode.

Upon its premiere, "The Legend of Boo-Kini Bottom" was watched by 2.210 million viewers, making it the eighth highest-rated cable program of October 13, 2017. The episode received positive reviews from critics.