Port Sinister
- Blwyddyn: 1953
- Gwlad: United States of America
- Genre: Adventure, Crime, Science Fiction
- Stiwdio: American Pictures Company
- Allweddair: piracy, giant crab, sunken city
- Cyfarwyddwr: Harold Daniels
- Cast: James Warren, Lynne Roberts, Paul Cavanagh, House Peters Jr., Robert Bice, William Schallert