The Adventures of Elmo in Grouchland

The Adventures of Elmo in Grouchland is a 1999 American musical adventure comedy film directed by Gary Halvorson in his feature film debut. It is the second film to be based on the popular children's television series Sesame Street, after Sesame Street Presents: Follow That Bird (1985), the film stars Mandy Patinkin and Vanessa Williams alongside Muppet performers Kevin Clash, Jerry Nelson, Frank Oz, and Steve Whitmire.

Produced by Jim Henson Pictures and the Children's Television Workshop, the film was released by Columbia Pictures on October 1, 1999. The film received generally positive reviews from critics, but was a box office bomb, grossing $12 million against a budget of more than $26 million.

The film is one of the few Sesame Street productions directly produced by The Jim Henson Company. Alongside Muppets from Space (which was released the same year), this is the final Muppet feature film to have the involvement of Oz, who retired from being a full-time puppeteer the following year. This was also the final theatrical Muppet film to feature Caroll Spinney before his death in 2019.