There's Something About Mary is a 1998 American romantic comedy film directed by Peter Farrelly and Bobby Farrelly, who co-wrote it with Ed Decter and John J. Strauss. The film features Cameron Diaz as the title character, while Ben Stiller, Matt Dillon, Lee Evans, and Chris Elliott all play men who are in love with Mary, and vying for her affection.

There's Something About Mary was released theatrically on July 15, 1998, by 20th Century Fox. It received generally positive reviews from critics, who praised its humor and Diaz's performance. The film became a major box office success, grossing over $369 million worldwide against its $23 million budget, becoming the fourth-highest-grossing film of the year. It is placed 27th in the American Film Institute's 100 Years, 100 Laughs: America's Funniest Movies, a list of the 100 funniest movies of the 20th century. In 2000, readers of Total Film magazine voted There's Something About Mary the fourth-greatest comedy film of all time.

Diaz won a New York Film Critics Circle Award for Best Actress, an MTV Movie Award for Best Performance, an American Comedy Award for Best Actress, a Blockbuster Entertainment Award for Best Actress. Her performance additionally was nominated for the Golden Globe Award for Best Actress – Motion Picture Musical or Comedy. The film was also nominated for a Golden Globe Award for Best Motion Picture – Musical or Comedy. It won four out of eight MTV Movie Awards, including Best Movie.