Session 9 is a 2001 American psychological horror film directed by Brad Anderson and written by Anderson and Stephen Gevedon. The film stars David Caruso, Peter Mullan, Brendan Sexton III, Josh Lucas, and Gevedon as an asbestos abatement crew who take a clean-up job at an abandoned mental asylum amid an intense work schedule, growing tensions, and mysterious events occurring around them. Its title refers to a series of audio-taped sessions with an asylum patient that run parallel to the crew's experiences.

The film marked a tonal departure for Anderson, who previously only directed romantic comedies. Production took place on location at the Danvers State Mental Hospital in Danvers, Massachusetts. While not a financial success, Session 9 developed a reputation as a cult film.