William Powell

Andrew Gentling

Shelley Winters

Catherine Sykes

Marsha Hunt

Martha Wier

Dorothy Hart

Helen Gentling

James Gleason

Captain Gledhill

Felix Bressart

Professor Morris Avrum

Art Baker

Henry Pritchard

Sheldon Leonard

Detective Pacciano

Howard Freeman

Dr. Markheim

Houseley Stevenson

Montgomery Thatcher

Paul Harvey

Mr. Arnspiger

Francis Pierlot

Dr. Herbert Watson

Jess Barker

Arnold Sykes

Mikel Conrad

Freddie Blair

Vangie Beilby

Old Lady at Lecture (uncredited)

Chester Erskine