American Reunion (also known as American Pie 4: Reunion or American Pie: Reunion in certain countries) is a 2012 American sex comedy film written and directed by Jon Hurwitz and Hayden Schlossberg. It is the fourth and final installment in the American Pie theatrical series. The film's ensemble cast features many actors who reprise their roles from the previous three films, including Jason Biggs, Alyson Hannigan, Chris Klein, Thomas Ian Nicholas, Seann William Scott, Eddie Kaye Thomas, Eugene Levy, Tara Reid, and Mena Suvari, among others. The film follows former East Great Falls High School classmates who return to their hometown for a reunion for their graduating class.

Released in the United States on April 6, 2012, American Reunion received generally mixed reviews from critics, but was a worldwide box office success, grossing $235 million against a $50 million budget.