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.

After months of traveling north on the Missouri River, the expedition encounters the Minnataree tribe and negotiate a peace offering.

Sacagawea, a Shoshone woman kidnapped by the Minnataree, requests to go with Lewis and Clark to act as a guide and return to her people.

Meanwhile, Charbonneau, a French man living in the tribe, joins the expedition, but secretly plans with the Minnataree to betray the group in exchange for Sacagawea.

After the deaths of some crewman, Gass informs the captains that the crew is aware of the duo's tension as well as learning that they have ventured far past the Louisiana territory and wish to journey back.

In 2011, Time Magazine rated The Far Horizons as one of the top ten most historically misleading films, in part due to its casting of Caucasian Donna Reed as Shoshone Sacagawea, and the creation of a romantic subplot between her character and William Clark, although Sacagawea's husband, French-Canadian trader Toussaint Charbonneau, was in real life also a member of the expedition.