Unknown World
- Joer: 1951
- Land: United States of America
- Genre: Adventure, Science Fiction
- Studio: Lippert Pictures
- Schlësselwuert: cave, exploration, scientific expedition, tunnel, underground lake, subterranean world, underground cavern, woman scientist, poison gas
- Direkter: Terry O. Morse
- Besetzung: Bruce Kellogg, Otto Waldis, Jim Bannon, Tom Handley, Dick Cogan, George Baxter