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Genestealers (Corporaptor Hominii) are an alien species in the Warhammer 40,000 universe, and the opponents of the marines in the Space Hulk board game. In more recent versions of that universe, Genestealers are a biological subgroup of the Tyranid, a nomadic alien race comprising many genetically engineered forms.

In 4th Edition of the wargame, there are two subgroups of the Genestealers: the Broodlord and the Genestealer.

For information concerning biomorphs and other mutable genetic characters of the Genestealers in the game, see Tyranid Genetics (Warhammer 40,000).

Genestealers appeared in the first edition of Warhammer 40,000 (Rogue Trader), but at the time were not related to Tyranid. They were simply noted as an "enigmatic monster ... from one of the moons of Ymgarl", now "spread throughout space" and "threatening to become a real menace". Since then it has been revealed that they are the advance forces of a Tyranid invasion and are now often seen as part of a Tyranid army.

Genestealers has not been a contender in any CBUB matches.