The Lost World is a 1960 American fantasy adventure film directed by Irwin Allen, loosely based on the 1912 novel of the same name by Arthur Conan Doyle. Shot in De Luxe Color and CinemaScope, the film's plot revolves around the exploration of a plateau in Venezuela inhabited by cannibals, dinosaurs, carnivorous plants, and giant spiders. The cast includes Claude Rains, David Hedison, Fernando Lamas, Jill St. John, and Michael Rennie.

The Lost World is a science fiction novel by British writer Sir Arthur Conan Doyle, published by Hodder & Stoughton in 1912, concerning an expedition to a plateau in the Amazon basin of South America where prehistoric animals still survive. It was originally published serially in the Strand Magazine and illustrated by New-Zealand-born artist Harry Rountree during the months of April–November 1912. The character of Professor Challenger was introduced in this book. The novel also describes a war between indigenous people and a vicious tribe of ape-like creatures.