Werewolves Within is a 2021 American mystery comedy horror film directed by Josh Ruben from a screenplay by Mishna Wolff, based on the video game of the same name from Red Storm Entertainment. It stars Sam Richardson, Milana Vayntrub, George Basil, Sarah Burns, Michael Chernus, Catherine Curtin, Wayne Duvall, Harvey Guillén, Rebecca Henderson, Cheyenne Jackson, Michaela Watkins, and Glenn Fleshler, and follows a group of people in a small Vermont town who get trapped in a snowstorm only to suspect one of them is a werewolf.

Plans for a Werewolves Within film adaptation began in October 2018, with Wolff writing the script and Ubisoft Motion Pictures producing it. The cast was announced in early 2020 and principal photography began in February 2020.

Werewolves Within had its world premiere at the Tribeca Film Festival on June 16, 2021, and began a limited theatrical release in the United States on June 25, 2021, followed by video on demand on July 2, by IFC Films. The film received generally positive reviews from critics for its screenplay, characters, and humor. It holds the highest-rated critic scores on Rotten Tomatoes and Metacritic for a film based on a video game.