Spencer's Mountain is a 1963 American family drama film written, directed and produced by Delmer Daves, from the 1961 novel of the same name by Earl Hamner Jr., and starring Henry Fonda and Maureen O'Hara. The supporting cast features early appearances by James MacArthur, Veronica Cartwright and Victor French, while longtime film actor Donald Crisp (in his final screen role) portrays "Grandpa" Spencer. Wally Cox, Virginia Gregg, Lillian Bronson, Whit Bissell and Dub Taylor also appear.

The movie, although set in Wyoming, is an inspiration for the long-running CBS television series The Waltons (set in the eastern U.S., in the Appalachian, Allegheny and Blue Ridge mountain chain and the upper southern Shenandoah Valley of western Virginia).