A feature film or feature-length film (often abbreviated to feature), also called a theatrical film, is a narrative film (motion picture or "movie") with a running time long enough to be considered the principal or sole presentation in a commercial entertainment program.

The term feature film came into use to refer to the main film presented in a cinema and the one which was promoted or advertised. The term was used to distinguish the longer film from the short films (referred to as shorts) typically presented before the main film, such as newsreels, serials, animated cartoons, live-action comedies and documentaries. There was no sudden increase in the running times of films to the present-day definitions of feature-length; the "featured" film on a film program in the early 1910s gradually expanded from two to three to four reels. Early features had been produced in the United States and France, but were released in individual (short film) scenes. This left exhibitors the option of playing them alone, to view an incomplete combination of some films, or to run them all together as a short film series.