The Princess Diaries is a 2001 American teen romantic comedy film directed by Garry Marshall and written by Gina Wendkos, based on Meg Cabot's 2000 novel of the same name. It stars Anne Hathaway (in her film debut) as Mia Thermopolis, a teenager who discovers that she is the heir to the throne of the fictional Kingdom of Genovia, ruled by her grandmother Queen dowager Clarisse Renaldi (Julie Andrews). The film also stars Heather Matarazzo, Héctor Elizondo, Mandy Moore, and Robert Schwartzman.

Released in North America on August 3, 2001, the film was a commercial success, grossing $165.3 million worldwide. The film was followed by a sequel, The Princess Diaries 2: Royal Engagement, released in August 2004.