The Unknown Terror
- Blwyddyn: 1957
- Gwlad: United States of America
- Genre: Horror
- Stiwdio: Emirau Productions, Regal Films
- Allweddair: amazon rainforest, mad scientist, missing person, underground cavern, man with limp, fungus people, primitive village
- Cyfarwyddwr: Charles Marquis Warren
- Cast: John Howard, Mala Powers, Paul Richards, May Wynn, Gerald Milton, Duane Grey