The Lost World may refer to:
- The Lost World trope.
- The Lost World, the 1912 novel by Sir Arthur Conan Doyle.
- The Lost World, the 1925 film based on the 1912 novel.
- Sir Arthur Conan Doyle's The Lost World, TV series based on the 1912 novel.
- The Lost World, 2001 TV Mini Series based on the 1912 novel.
- The Lost World, 1995 sequel novel to Jurassic Park by Michael Crichton.
- The Lost World: Jurassic Park, 1997 film which is the sequel to Jurassic Park, based on the above.
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