The Lost World is a 1995 science fiction action novel written by Michael Crichton, and the sequel to his 1990 novel Jurassic Park. It is his tenth novel under his own name and his twentieth overall, and it was published by Knopf. A paperback edition (ISBN 0-345-40288-X) followed in 1996. In 1997, both novels were re-published as a single book titled Michael Crichton's Jurassic World, which is unrelated to the 2015 film of the same name.