Murder by Decree
- Blwyddyn: 1979
- Gwlad: Canada, United Kingdom
- Genre: Crime, Mystery, Thriller
- Stiwdio: Canadian Film Development Corporation, Famous Players, Highlight
- Allweddair: jack the ripper, sherlock holmes
- Cyfarwyddwr: Bob Clark
- Cast: Christopher Plummer, James Mason, David Hemmings, Susan Clark, Anthony Quayle, John Gielgud