Other Mommy is an upcoming American supernatural psychological horror film directed by Rob Savage and written by Nathan Elston. The film is based on the 2024 novel Incidents Around the House by Josh Malerman. It stars Jessica Chastain as a mother who must do everything to protect her daughter from a supernatural entity that resembles her. Jay Duplass, Arabella Olivia Clark, Dichen Lachman, Arian Moayed, and Karen Allen also star in the film. James Wan serves as a producer through his Blumhouse–Atomic Monster banner, in association with Spin a Black Yarn. Other Mommy is scheduled to be released in the United States by Universal Pictures on October 9, 2026.