American Pie is a 1999 teen comedy film written by Adam Herz. American Pie was the directorial film debut of brothers Paul and Chris Weitz, and the first film in the American Pie film series. The film was a box-office hit and spawned three direct sequels: American Pie 2 (2001), American Wedding (2003) and American Reunion (2012). The film concentrates on four boys who make a pact to lose their virginity before their high school graduation. The title is borrowed from the folk song of the same name and refers to a scene in the film, in which the lead character is caught masturbating with a pie after being previously told that third base feels like "warm apple pie". It's also been stated by writer Adam Herz that the title also refers to the quest of losing your virginity in high school, which is as "American as apple pie."

Since the conclusion of the American Pie trilogy, featuring the courtship and marriage of the characters Jim Levenstein and Michelle Flaherty, the American Pie name has gone on to be used as an entity similar to the National Lampoon film series. American Pie has spawned four direct-to-DVD spin-off films bearing the title American Pie Presents: Band Camp (2005), The Naked Mile (2006), Beta House (2007) and The Book of Love (December 2009). A fourth theatrical release in the series, entitled American Reunion, was released on April 6, 2012.