Key Witness
- Година: 1947
- Земја: United States of America
- Genанр: Crime, Drama, Thriller
- Студио: Columbia Pictures
- Клучен збор: inventor, film noir, murder, corpse
- Директор: D. Ross Lederman
- Улоги: John Beal, Trudy Marshall, Jimmy Lloyd, Helen Mowery, Wilton Graff, Barbara Read