Alan Arkin
Schmendrick (voice)
Jeff Bridges
Prince Lir (voice)
Mia Farrow
Unicorn / Amalthea (voice)
Tammy Grimes
Molly Grue (voice)
Robert Klein
The Butterfly (voice)
Angela Lansbury
Mommy Fortuna (voice)
Christopher Lee
King Haggard (voice)
Keenan Wynn
Captain Cully / Harpy (voice)
Paul Frees
Mabruk (voice)
René Auberjonois
The Skull (voice)
Theodore Gottlieb
Ruhk (voice)
Don Messick
The Cat (voice)
Jack Lester
Hunter #1 / Old Farmer / Cully's Men (voice)
Nellie Bellflower
The Tree (voice)
Ed Peck
Jack Jingley / Cully's Men (voice)
Ken Jennings
Hunter #2 / Cully's Men
Gerry Beckley
The Balladeer (voice) (uncredited)
Dewey Bunnell
The 2nd Balladeer (voice) (uncredited)
Brad Palmer
The Balladeers' Bassist / Chorus (voice) (uncredited)