William Powell

Lt. William 'Bill' Gordon / Anson Meridan

Rosalind Russell

Joel Carter

Lionel Atwill

Maj. William Brennan

Cesar Romero

Capt. Nicholas 'Nikki' Nieterstein

Samuel S. Hinds

John Carter, Assistant Secretary of War

Henry Stephenson

Russian Ambassador Gregory

Frank Reicher

Dr. R.A. Jackson

Charley Grapewin

Prof. Martin

Charles Trowbridge

Secretary of War Baker

Margaret Dumont

Mrs. Hendricks (uncredited)

Mary Forbes

Lady Cavendish (uncredited)

Tom Dugan

Agent Patrick O'Reilly (uncredited)

Winter Hall

Chaplain (uncredited)

Milburn Stone

Carter's Aide (uncredited)

Theodore von Eltz

Desk Clerk Assistant (uncredited)

Edgar Dearing

1st Military Policeman (uncredited)

James Flavin

2st Military Policeman (uncredited)

Sterling Holloway

Taxi Driver (uncredited)

Mickey Rooney

Country Boy (uncredited)

Melville Cooper

Doorman (uncredited)

Johnny Arthur

Code Room Clerk (uncredited)

Edward Earle

Man in Code Room (uncredited)

David Burns

German-Speaking Bellhop (uncredited)

Charles Coleman

Café Doorman (uncredited)

Guy Usher

Ship's Captain (uncredited)

John Harmon

Telegrapher (uncredited)