Unsane is a 2018 American psychological thriller film directed by Steven Soderbergh and written by Jonathan Bernstein and James Greer. The film stars Claire Foy, Joshua Leonard, Jay Pharoah, Juno Temple, Aimee Mullins, and Amy Irving. Matt Damon has a cameo appearance as a detective. The film follows a woman confined to a mental institution after she is pursued by a stalker. The film was shot entirely on the iPhone 7 Plus.

Unsane had its world premiere at the Berlin International Film Festival on February 21, 2018, and was theatrically released in the United States on March 23, 2018, by Soderbergh's production company Fingerprint Releasing and Bleecker Street. The film was a commercial success, grossing over $14 million on a budget of $1.5 million. It received generally positive reviews from critics, who mainly praised the performances, direction, cinematography and production values.