The Decline of the American Empire (French: Le Déclin de l'empire Américain) is a 1986 Canadian sex comedy-drama film directed by Denys Arcand and starring Rémy Girard, Pierre Curzi and Dorothée Berryman. The film follows a group of intellectual friends from the Université de Montréal history department as they engage in a long dialogue about their sexual affairs, touching on issues of adultery, homosexuality, group sex, BDSM and prostitution. A number of characters associate self-indulgence with societal decline.

The film was a box office success in Canada and internationally and received good reviews. It won the FIPRESCI Prize at the Cannes Film Festival, nine Genie Awards, including Best Motion Picture, and was the first Canadian film nominated for the Academy Award for Best Foreign Language Film. It was followed by two sequels, The Barbarian Invasions in 2003 and Days of Darkness in 2007.