"SpongeBob SquarePants vs. The Big One", also known as "The Secret of Kahuna Laguna" and "SpongeBob SquarePants and The Big Wave" is the 11th episode of the sixth season and the 111th overall episode of the American animated television series SpongeBob SquarePants. The episode was written by Aaron Springer who also directed the storyboards, Paul Tibbitt, and Steven Banks, and the animation was directed by Andrew Overtoom and supervising director, Alan Smart. The episode was part of the series' tenth anniversary celebration in 2009. It features guest appearances by Johnny Depp as the voice of Jack Kahuna Laguna, Bruce Brown as the narrator, and Davy Jones as himself. It originally aired on Nickelodeon in the United States on April 17, 2009.

The series follows the adventures and endeavors of the title character and his various friends in the underwater city of Bikini Bottom. In this episode, SpongeBob and his friends — Patrick, Squidward, Mr. Krabs, and Sandy — are swept away by a giant wave. They get separated from each other; SpongeBob, Patrick, and Squidward find themselves stranded on a remote tropical island. To get back home to Bikini Bottom, they search for Jack Kahuna Laguna, a surf guru who can teach them the gnarly surf moves to hit the elusive wave, The Big One, in order to return home.

Upon premiere, the episode pulled an average of 5.8 million viewers, and met positive reviews. On March 3, 2009, the DVD and the video game based on the episode was released simultaneously.