Heart o' the Hills is a 1919 American silent drama film directed by Joseph De Grasse and Sidney Franklin, written by Bernard McConville based on John Fox Jr.'s novel of the same name.

One day the chief is looking for the 13-year-old mountain girl Mavis Hawn (Mary Pickford), who is shooting bullets in the woods.

Mavis desires revenge after a few gang members attacked her home and shot and killed her father.

Chief Honeycutt visits Mavis' widowed mother Martha Hawn (Claire McDowell) and flirts with her.

When a group of planters and capitalists come to town intending to exploit mountain coal lands, Mavis scares them away with her gun.

She and Jason later run into the rich aristocrat Gray Pendleton (John Gilbert) and his sweetheart Marjorie Lee (Betty Bouton), who are looking for the town.

When word hits town that a man named Morton Sanders (Henry Hebert) is planning to take over the city, some of the inhabitants, including Mavis, threaten him to force him go away.

Biographer Jeanine Basinger considers these productions “some of the most successful films of Pickford’s career" and those in which the actress fully realizes her emerging screen persona.