The Righteous is a 2021 Canadian psychological thriller film, written, executive produced, and directed by Mark O'Brien. The film stars Henry Czerny and Mimi Kuzyk as Frederick and Ethel Mason, a former priest and his wife who are grieving the death of their adopted daughter, when Aaron Smith (O'Brien) arrives at their home, initially in need of help but gradually revealing his real motives for wanting to see Frederick.The film's cast also includes Kate Corbett as Doris, the troubled birth mother of the Mason's daughter, as well as Mayko Nguyen and Nigel Bennett in supporting roles.

The film premiered at the 2021 Fantasia Film Festival. It was subsequently picked up for streaming distribution in Europe by Arrow Films, while North American distribution will be handled by Vortex Media.