Whispering Smith Speaks

George O'Brien

Gordon Harrington, Jr. aka John 'Whispering' Smith

Irene Ware

Nan Roberts

Kenneth Thomson

J. Wesley Hunt

Maude Allen

Mrs. Roberts

Spencer Charters

Cal Stone

Victor Potel

Bill Prouty

Edward Keane

Rebstock

Frank Sheridan

Gordon Harrington, Sr.

William V. Mong

Blake

Maurice Cass

C. Luddington Colfax

Allan Cavan

Harrington Office Worker (uncredited)

Bess Flowers

Secretary (uncredited)

John Ince

Conductor (uncredited)

Si Jenks

Oiler (uncredited)

J.P. McGowan

Caboose Passenger (uncredited)

Dick Rush

Denver Police Chief (uncredited)