Two Lost Worlds is a 1951 science fiction/adventure film directed by Norman Dawn and starring James Arness and Laura Elliott.

The film was scripted by Phyllis Parker (with later, added scenes written by Tom Hubbard and voice-over narrative by Bill Shaw), and distributed by Eagle-Lion Classics Inc., with a 1952 reissue by Classic Pictures Inc. On August 16, 1830 the American clipper ship Hamilton Queen, sails from Salem bound for the East Indies.

The clipper outruns the pirate ship and Captain Tallman heads to Queensland, Australia so that Kirk can get medical treatment.

While at the hospital, he meets and falls in love with Elaine Jeffries (Rogers), the fiancée of Martin Shannon a rancher.

A romantic rivalry develops and the pirates, who attacked Kirk and his ship kidnap her along with her friend, Nancy Holden.