- Jack Nicholson as Randle Patrick "R.P." McMurphy
- Louise Fletcher as Nurse Mildred Ratched
- Will Sampson as "Chief" Bromden
- William Redfield as Dale Harding
- Brad Dourif as Billy Bibbit
- Sydney Lassick as Charlie Cheswick
- Christopher Lloyd as Max Taber
- Danny DeVito as Martini
- Dean Brooks as Dr. John Spivey
- William Duell as Jim Sefelt
- Vincent Schiavelli as Bruce Frederickson
- Michael Berryman as Ellis
- Alonzo Brown as Attendant Miller
- Mwako Cumbaka as Attendant Warren
- Nathan George as Attendant Washington
- Marya Small as Candy
- Scatman Crothers as Night Guard Turkle
- Phil Roth as Woolsey
- Louisa Moritz as Rose
- Peter Brocco as Col. Matterson
- Delos V. Smith Jr. as Scanlon
- Josip Elic as Bancini
- Mimi Sarkisian as Nurse Pilbow
- Ted Markland as Hap Arlich
- Mary Costa as Mrs. Johnson
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