- Author: Douglas Adams
- Pages: 832 pages
- Publisher: Pocket Books
- Published in: 1997
Published in 1997, this 832 page leatherbound final omnibus edition contains five Hitchhiker series novels and one short story: The Hitchhiker's Guide to the Galaxy; The Restaurant at the End of the Universe; Life, the Universe and Everything; So Long, and Thanks for All the Fish; Mostly Harmless; Young Zaphod Plays it Safe. Also appearing in The Ultimate Hitchhiker's Guide, at the end of Adams' introduction, is a list of instructions on How to Leave the Planet, providing a humorous explanation of how one might replicate Arthur and Ford's feat at the beginning of Hitchhikers.