Cast & crew
The Spiral Staircase (1946)
Directed by Robert Siodmak Written by Mel Dinelli
Cast
| Dorothy McGuire | Helen |
| George Brent | Professor Warren |
| Ethel Barrymore | Mrs. Warren |
| Kent Smith | Dr. Parry |
| Erville Alderson | Dr. Harvey (uncredited) |
| Rhonda Fleming | Blanche |
| Gordon Oliver | Steve Warren |
| Elsa Lanchester | Mrs. Oates |
| Sara Allgood | Nurse Barker |
| Rhys Williams | Mr. Oates |
| James Bell | Constable |
| Ellen Corby | Neighbour (uncredited) |
| George Holmes | The Killer's 'Shadow' (uncredited) |
| Myrna Dell | Murder Victim (uncredited) |
| Stanley Price | Starry-eyed Man (uncredited) |
| Richard Tyler | Freddy (uncredited) |
| Robert Siodmak | The Killer's 'Eye' (uncredited) |
| Larry Wheat | Minister (uncredited) |
| Charles Wagenheim | Desk Clerk (uncredited) |
Crew
| Robert Siodmak | Director |
| Nicholas Musuraca | Director of Photography |
| Roy Webb | Original Music Composer |
| Mel Dinelli | Screenplay |
| Dore Schary | Producer |
| Ethel Lina White | Novel |
| Jack Okey | Art Direction |
| Albert S. D'Agostino | Art Direction |
| Harry Marker | Editor |
| Harry Gerstad | Editor |
| Harry Scott | Assistant Director |
| C. Bakaleinikoff | Music Director |
| Vernon L. Walker | Special Effects |
| Darrell Silvera | Set Decoration |
| Gordon Carveth | Stunts |
| Edgar Peterson | Production Assistant |
| Chris Crowell | Digital Compositor |
| Samuel Hoffman | Musician |
| Terry Kellum | Sound |
| John L. Cass | Sound |
| Fred Fleck | Production Manager |
| Edward Stevenson | Costume Design |