- Humphrey Bogart as Sam Spade
- Mary Astor as Ruth Wonderly/Brigid O'Shaughnessy
- Gladys George as Iva Archer
- Peter Lorre as Joel Cairo
- Barton MacLane as Lieutenant Dundy
- Lee Patrick as Effie Perine
- Sydney Greenstreet as Kasper Gutman
- Ward Bond as Detective Tom Polhaus
- Jerome Cowan as Miles Archer
- Elisha Cook Jr. as Wilmer Cook
- James Burke as Luke, hotel detective
- Murray Alper as Frank Richman, taxi driver
- John Hamilton as District Attorney Bryan
- Walter Huston as Captain Jacoby (uncredited)
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