The Three Mesquiteers is the umbrella title for a Republic Pictures series of 51 American Western B-movies released between 1936 and 1943.

The films, featuring a trio of Old West adventurers, was based on a series of Western novels by William Colt MacDonald.

The eponymous trio, with occasional variations, were called Stony Brooke, Tucson Smith and Lullaby Joslin.

The series was the only one of its kind to be specifically named and ranked in contemporary polls of the top Western film stars.

Monogram also released The Rough Riders (1941–42), again poaching a Mesquiteer in the form of Raymond Hatton, and The Trail Blazers (1943–44).