The Provincetown International Film Festival (PIFF) is an annual film festival founded in 1999 and held on Cape Cod in Provincetown, Massachusetts. The festival presents American and international narrative features, documentaries and short films for five days in June of each year.

The festival is a program of the Provincetown Film Society, the non-profit parent organization which also operates the year-round Waters Edge Cinema (formerly known as Whaler's Wharf Cinema), a year-round Provincetown movie theater presenting what it considers the best in current independent and international cinema.

The festival hosts panel discussions and special programs such as Youth and Diversity and Portuguese film sidebars, the festival incorporates the cultural, historic, and artistic character of Provincetown: with its thriving art colony, its large gay and lesbian population, its original Native American and Portuguese heritage, and its congenial scenic setting. In keeping with its mission, the festival often presents films about countercultural figures, such as John Lennon, Beat poet Allen Ginsberg, and writer William S. Burroughs.