All About Evil is a 2010 American black comedy slasher film and marks the feature film directorial debut of Joshua Grannell, who also wrote the script. The film stars Natasha Lyonne as an unhinged theatre owner who begins making snuff films and screening them at her decrepit San Francisco theater — presenting them as fictional works — in order to prevent the theater from going bankrupt.

The film was shot at the Victoria Theatre in San Francisco and also stars Thomas Dekker, Cassandra Peterson, Noah Segan, and Jack Donner. The soundtrack featured a score by Vinsantos and songs by artists such as The Vanishing. Grannell based the film on his 2003 short Grindhouse; the film's title, All About Evil, refers to the 1950 drama film All About Eve. All About Evil premiered at the 2010 San Francisco International Film Festival and Grannell independently released the film to DVD that same year. The film was later given a new home video release in 2022 through Severin Films.