New Frontier (also known as Frontier Horizon)^[1] is a 1939 American Western film starring John Wayne, Ray "Crash" Corrigan, Raymond Hatton, and Jennifer Jones. This was the last of eight Three Mesquiteers Western B-movies^[2] with Wayne (there were 51 altogether). A restored 35 mm copy of the film exists, and was screened at the Museum of Modern Art in New York City as part of a 2007 John Wayne centennial retrospective, which included The Big Trail, The Searchers, and True Grit. The leading lady is Jennifer Jones, billed as Phylis Isley, in her film debut. The director was George Sherman.

When politician William Proctor announces that a dam will be built on a site where many settlers have built homes, a retired major who founded the settlement leads a backlash. Eventually, the fight comes to the attention of the Three Mesquiteers—Stoney Brooke, Tucson Smith and Rusty Joslin—who try to find a peaceful solution. However, they soon realize Proctor will resort to any trickery to get his way.

• John Wayne filmography