* Marilyn Monroe as Sugar Kane Kowalczyk
* Tony Curtis as Jerry/Daphne
* Jack Lemmon as Joe/Josephine
The film also features a supporting cast including:
* Joe E. Brown as Osgood Fielding III
* George Raft as Spats Colombo
* Pat Crowley as Sweet Sue
* Nehemiah Persoff as "The Little Bonaparte"
* Barbara Nichols as "The Girl in the Red Dress"