Space Assassin is a single-player roleplaying gamebook written by Andrew Chapman, illustrated by Geoffrey Senior and originally published in 1985 by Puffin Books. It forms part of Steve Jackson and Ian Livingstone's Fighting Fantasy series. It is the 12th in the series in the original Puffin series (ISBN 0-14-031861-5). There are currently no announced plans to republish the book as part of the modern Wizard series.