- James Dean as James "Jim" Stark
- Natalie Wood as Judy
- Sal Mineo as John "Plato" Crawford
- Jim Backus as Frank Stark
- Ann Doran as Carol Stark
- Corey Allen as Buzz Gunderson
- William Hopper as Judy's father
- Rochelle Hudson as Judy's mother
- Edward Platt as Inspector Ray Fremick
- Marietta Canty as the Crawford family maid
- Virginia Brissac as Grandma Stark
- Dennis Hopper as Goon
- Jack Grinnage as Moose
- Frank Mazzola as Crunch
- Ian Wolfe as Dr. Minton, lecturer at planetarium
- Beverly Long as Helen
- Robert Foulk as Gene
- Jack Simmons as Cookie
- Tom Bernard as Harry
- Nick Adams as Chick
- Steffi Sidney as Mil
- Clifford Morris as Cliff
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