William Powell

Lt. William 'Bill' Gordon / Anson Meridan

Rosalind Russell

Joel Carter

Binnie Barnes

Olivia Karloff

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

Leonard Mudie

Roberts

Howard Hickman

G-Man

Charles Trowbridge

Secretary of War Baker

Murray Kinnell

de Segroff

Margaret Dumont

Mrs. Hendricks (uncredited)

Mary Forbes

Lady Cavendish (uncredited)

Tom Dugan

Agent Patrick O'Reilly (uncredited)

Bernadene Hayes

Bobbie Burns (uncredited)

Winter Hall

Chaplain (uncredited)

Hedwiga Reicher

De Segroff's Associate (uncredited)

Milburn Stone

Carter's Aide (uncredited)

Theodore von Eltz

Desk Clerk Assistant (uncredited)

Sid Silvers

Recruiter (uncredited)

Sidney Bracey

Jackson's Assistant (uncredited)

Edgar Dearing

1st Military Policeman (uncredited)

James Flavin

2st Military Policeman (uncredited)

Hans Fuerberg

German Torpedo Man (uncredited)

Sterling Holloway

Taxi Driver (uncredited)

William V. Mong

Hotel Desk Clerk (uncredited)

Mickey Rooney

Country Boy (uncredited)

Melville Cooper

Doorman (uncredited)

Rudolph Anders

Radio Operator (uncredited)

Sam Savitsky

Colonel Petroff (uncredited)

Morgan Wallace

Gardner (uncredited)

Bert Moorhouse

2nd Lieutenant (uncredited)

Frank Lackteen

Customs Officer in Mexico (uncredited)

Belle Mitchell

Mexican (uncredited)

Sam Ash

Mexican (uncredited)

Lynton Brent

Decoder (uncredited)

Cyril Ring

Orderly (uncredited)

Rollo Dix

Orderly (uncredited)

Michael Vallon

Orderly (uncredited)

Monte Vandergrift

Sailor (uncredited)

Larry Steers

Partitioner (uncredited)

William Newell

Carter's Receptionist (uncredited)

Gino Corrado

Code Room Clerk (uncredited)

Johnny Arthur

Code Room Clerk (uncredited)

Edward Earle

Man in Code Room (uncredited)

Harry C. Bradley

Cashier (uncredited)

David Burns

German-Speaking Bellhop (uncredited)

Max Barwyn

Boris Stronskoff - Russian Singer (uncredited)

Charles Coleman

Café Doorman (uncredited)

Frank O'Connor

Officer (uncredited)

Bob Perry

G-Man (uncredited)

Leonid Snegoff

Kaieneff (uncredited)

Guy Usher

Ship's Captain (uncredited)

Henry Mowbray

Diplomat (uncredited)

Lee Kohlmar

Tailor (uncredited)

James P. Burtis

Private (uncredited)

Al Bridge

Sergeant (uncredited)

Arno Frey

Army Officer (uncredited)

Lowden Adams

Butler (uncredited)

Sherry Hall

Pvt. Dean (uncredited)

Eileen O'Malley

Red Cross Nurse (uncredited)

Eric Wilton

Kesterman (uncredited)

Earl Eby

G-Man (uncredited)

John Harmon

Telegrapher (uncredited)

Harry 'Zoup' Welsh

Barber (uncredited)

Jack Hatfield

Drug Store Clerk (uncredited)