The Nimrod Hunt is a 1986 science fiction novel by American writer Charles Sheffield. The story takes place hundreds of years in the future, with humanity having extensively colonized surrounding space, including beyond the Solar System. Humans have encountered three extraterrestrial races, which although all bizarrely different in physiology and psychology coexist peacefully. In order to defend from unknown threats beyond known space, a security company creates highly advanced robotic soldiers to patrol the border. These go haywire and become the single greatest threat. A series of four-member teams, with a representative from each species, is dispatched to deal with the problem. The action of the story follows one such team.