- Marilyn Monroe as Sugar "Kane" Kowalczyk
- Tony Curtis as Joe/"Josephine"/"Shell Junior"
- Jack Lemmon as Jerry (Gerald)/"Daphne"
- George Raft as "Spats" Colombo
- Joe E. Brown as Osgood Fielding III.
- Pat O'Brien as Detective Mulligan
- Nehemiah Persoff as "Little Bonaparte"
- Joan Shawlee as Bandleader Sweet Sue
- Billy Gray as Sig Poliakoff, Joe and Jerrys agent
- George E. Stone as "Toothpick" Charlie
- Dave Barry as Bandmanager Beinstock
- Mike Mazurki as Spats's henchman #1
- Harry Wilson as Spats's henchman #2
- Beverly Wills as Dolores, trombone, Sugars apartment friend
- Babara Drew as Nellie, Poliakoffs secretary
- Edward G. Robinson, Jr. as Bellboy Johnny Paradise
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- uncredited roles:
- Mary Foley as violin player
- Colleen O'Sullivan a.k.a. Penny McGuiggan as Maude, trumpet
- Joan Kayne a.k.a. Joan Fields as Betty, clarinet
- Joan Waldor as drummer
- Helen Perry as Stella, trombone
- Sandra Warner as Emily, saxophone
- Gloria Tracy a.k.a. Tracy Moss as Gloria, harp
- Laurie Mitchell as Mary Lou, trumpet
- Marian Collier as Olga, clarinet
- Grace Whitney as Rosella, trumpet
- Pat Holbrook as band member
- Diane Boothe as band member
- Kay Rickman as Hortensia, violin
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