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Monsters, Inc. is a 2001 American computer-animated comedy film directed by Pete Docter, produced by Pixar Animation Studios and released by Walt Disney Pictures. Co-directed by Lee Unkrich and David Silverman, the film centers around two monsters employed at the titular Monsters, Inc.: top scarer James P. "Sulley" Sullivan (John Goodman), and his one-eyed assistant and best friend, Mike Wazowski (Billy Crystal). Monsters, Inc. employees generate their city's power by targeting and scaring children, but they are themselves afraid that the children may contaminate them; when one child enters Monstropolis, Mike and Sulley must return her.

Docter began developing the film in 1996 and wrote the story with Jill Culton, Jeff Pidgeon, and Ralph Eggleston. Fellow Pixar director Andrew Stanton wrote the screenplay with screenwriter Daniel Gerson. The characters went through many incarnations over the film's five-year production process. The technical team and animators found new ways to render fur and cloth realistically for the film. Randy Newman, who composed the music for Pixar's three prior films, returned to compose its fourth.

Although the film suffered from two lawsuits against the filmmakers, filed by Lori Madrid before the film's release and Stanley Mouse in 2002 respectively, that were ultimately dismissed, Monsters, Inc. was praised by critics and proved to be a major box office success from its release on November 2, 2001, generating over $562 million worldwide.

Monsters, Inc. saw a 3D re-release in theaters on December 19, 2012. Its prequel, Monsters University, directed by Dan Scanlon, was released on June 21, 2013.