The Sonoma International Film Festival (SIFF) is an American film festival that began in 1997. It takes place each April in the Sonoma Valley of California and is hosted by the Sonoma International Film Society, a 501c3 nonprofit organization. The festival contributes to the support of the Student Film Department at Sonoma Valley High School and includes in its program a showcase of student films. Film presentations are held at a variety of venues including the historic Sebastiani Theater on the Sonoma town plaza. All venues are within walking distance of the plaza.