The Far Horizons is a 1955 American historical western film directed by Rudolph Maté about the Lewis and Clark Expedition. It is based on 1943 novel Sacajawea of the Shoshones by Della Gould Emmons and stars Fred MacMurray, Charlton Heston, Donna Reed and Barbara Hale.

The film is the only major American motion picture on the Lewis and Clark Expedition, although there have been television documentaries on the subject. Many details are fictional and historically inaccurate. It was re-released in 1962 by Citation Films Inc. as Untamed West in a double feature with Jungle Attack.