| Alan Arkin | Schmendrick |
| Jeff Bridges | Prince Lir |
| Mia Farrow | Unicorn/Amalthea |
| Tammy Grimes | Molly Grue |
| Robert Klein | The Butterfly |
| Angela Lansbury | Mommy Fortuna |
| Christopher Lee | King Haggard (also in german language version) |
| Keenan Wynn | Captain Cully |
| Paul Frees | Mabruk |
| Rene Auberjonois | The Skull |
| Brother Theodore | Ruhk |
| Jack Lester | |
| Ed Peck | (as Edward Peck) |
| Don Messick | The Cat |
| Nellie Bellflower | The Tree |
| Kenneth Jennings |
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