Robin Williams as The Frog / Prince Robin

Teri Garr as Princess

René Auberjonois as King Ulrich

Candy Clark as Queen Gwynneth / Candy

Roberta Maxwell as Queen Beatrice / Griselda

Michael Richards as King Geoffrey

Donovan Scott as Hendrix / The French Chef

Charlie Dell as The Page

Van Dyke Parks as The Musician

Harry Benson as The Grandfather Clock

Eric Idle as Narrator

Shelley Duvall as Self - Host (uncredited)