Nancy Drew and the Hidden Staircase

Actors
• Bonita Granville .... Nancy Drew
• Frankie Thomas .... Ted Nickerson
• John Litel .... Carson Drew
• Frank Orth .... Captain Tweedy
• Renie Riano .... Effie Schneider, the Housekeeper
• Vera Lewis .... Miss Rosemary Turnbull
• Louise Carter .... Miss Floretta Turnbull
• William Gould .... Daniel Talbert
• George Guhl .... Smitty, a Policeman
• John Ridgely .... Reporter
• William Hopper .... Reporter (as DeWolf Hopper)
• Creighton Hale .... Reporter
• Frank Mayo .... Tribune Photographer
• Frederic Tozere .... District Attorney's Investigator
• Don Rowan .... Phillips the Chauffeur
• Dick Elliott .... McKeever
• Nat Carr .... Policeman (uncredited)
• Sol Gorss .... Reporters' Driver (uncredited)
• Frank Meredith .... Motorcycle Policeman (uncredited)
• Jack Mower .... Ice Company Dispatcher (uncredited)
• Psyche Neibert .... Turnbull's Kitchen Maid (uncredited)
• Paul Panzer .... Reporter (uncredited)
• Eddie Parker .... Motorcycle Policeman (uncredited)
• Bob Reeves .... Cop (uncredited)
• Jack Richardson .... Reporter (uncredited)
• Cliff Saum .... Burt the Iceman (uncredited)
• Joanne Tree .... Teen (uncredited)
• Jack Wise .... Second Photographer (uncredited)

Director
• William Clemens

Producer
• Bryan Foy
• Hal B. Wallis
• Jack L. Warner

Cinematography
• L. William O'Connell