
Key Witness
- År: 1947
- Land: United States of America
- Genre: Kriminalitet, Drama, Thriller
- Studio: Columbia Pictures
- Nøgleord: inventor, film noir, murder, corpse
- Direktør: D. Ross Lederman
- Cast: John Beal, Trudy Marshall, Jimmy Lloyd, Helen Mowery, Wilton Graff, Barbara Read