A grindhouse or action house is an American term for a theatre that mainly shows low-budget horror, splatter, and exploitation films for adults. According to historian David Church, this theater type was named after the "grind policy", a film-programming strategy dating back to the early 1920s which continuously showed films at cut-rate ticket prices that typically rose over the course of each day. This exhibition practice was markedly different from the era's more common practice of fewer shows per day and graduated pricing for different seating sections in large urban theatres, which were typically studio-owned.

An exploitation film is a film that tries to succeed financially by exploiting current trends, niche genres, or lurid content. Exploitation films are generally low-quality "B movies", though some set trends, attract critical attention, become historically important, and even gain a cult following.