Ron Howard Richie Cunningham Actor Henry Winkler Arthur "Fonzie" Fonzarelli Actor Tom Bosley Howard Cunningham Actor Marion Ross Marion Cunningham Actor Anson Williams Warren "Potsie" Weber Actor Don Most Ralph Malph Actor Erin Moran Joanie Cunningham Actor Gavan O'Herlihy Chuck Cunningham Guest Star Ed Begley Jr. Hank Guest Star Jack Riley Officer O'Reilly Guest Star Herb Wallerstein Director