Robert Montgomery
— Jeff
Sally Eilers
— Mona
Madge Evans
— Claire
Eugene Pallette
— Terwilliger
C. Henry Gordon
— Mayor Starling
Jean Parker
— Adele
Bess Flowers
— Wardrobe fitter
Billy Gilbert
— Commissioner Jerry Allesandro (uncredited)
Ivan Lebedeff
— Ramon Salinas
David Newell
— O'Neill - Mayor's Secretary
Vince Barnett
— Snitz Lepedis
Joseph Cawthorn
— Maxie Schultz
Ernie Adams
— Elmer - Jeff's Chauffeur
William Bailey
— Attorney in Courtroom
Vangie Beilby
— Aunt Effie
Zeffie Tilbury
— Aunt Ada
Richard Tucker
— Party Guest
Harry Stubbs
— Party Guest
Ferdinand Munier
— General Boyland
Harold Miller
— Nightclub Patron
Eva McKenzie
— Aunt Emma
Tom London
— Plainclothesman
DeWitt Jennings
— Moriarty
Bud Geary
— Reporter in Courtroom
Bill Elliott
— Night Club Patron
Claire Du Brey
— Miss Squires - Jeff's Secretary
Don Brodie
— Don Brodie
Wade Boteler
— Police Inspector Burke
Sherry Hall
— Reporter
Phillips Smalley
— Judge