Will Geer (March 9, 1902 – April 22, 1978) was an American actor and social activist. His original name was William Aughe Ghere. He is remembered for his portrayal of Grandpa Zebulon Tyler Walton in the 1970s TV series, The Waltons.

Geer made his Broadway debut as Pistol in a 1928 production of Much Ado About Nothing, created the role of Mr. Mister in Marc Blitzstein's The Cradle Will Rock, played Candy in John Steinbeck's theatrical adaptation of his novella Of Mice and Men, and appeared in numerous plays and revues throughout the 1940s. From 1948 to 1951, he appeared in more than a dozen movies, including Winchester '73 (as Wyatt Earp), Broken Arrow, Comanche Territory (all 1950) and Bright Victory (1951).