Richard Thomas John Boy Walton Actor Ralph Waite John Walton Actor Michael Learned Olivia Walton Actor Will Geer Zeb "Grandpa" Walton Actor Ellen Corby Esther "Grandma" Walton Actor Judy Norton Mary Ellen Walton Willard Actor Jon Walmsley Jason Walton Actor Mary Beth McDonough Erin Walton Actor Eric Scott Ben Walton Actor David W. Harper Jim-Bob Walton Actor Kami Cotler Elizabeth Walton Actor John Crawford Sheriff Ep Bridges Actor Helen Kleeb Mamie Baldwin Actor Adele Clair Guest Star Iler Rasmussen Guest Star Denver Pyle Guest Star Mary Jackson Emily Baldwin Guest Star Lee Rich Executive Producer Robert L. Jacks Producer Jack Shea Director