There's Someone Inside Your House is a 2021 American slasher film directed by Patrick Brice and adapted by Henry Gayden. It is an adaptation of the 2017 novel of the same name by Stephanie Perkins and stars Sydney Park, Théodore Pellerin, Asjha Cooper, Jesse LaTourette, and Diego Josef. The plot follows Makani Young (Park), a senior transfer student from Hawaii who finds herself in the center of gruesome murder cases in her newly acquainted town of Osborne, Nebraska.

There's Someone Inside Your House was announced in March 2018, with Shawn Levy and James Wan producing through their respective production banners 21 Laps and Atomic Monster, for Netflix. Principal photography took place the following year in Vancouver with cinematographer Jeff Cutter; additional filming concluded in August 2020. During post-production, editing was completed by Michel Aller and the musical score was composed by Zachary Dawes.

There's Someone Inside Your House premiered at Fantastic Fest on September 23, 2021, and was released on Netflix on October 6, 2021. It received mixed reviews from critics.