The Marro are a peculiar species from the game Heroscape. Their species has been recruited by the Valkyrie Utgar in his quest to dominate Valhalla.

The Marro are a skeleton-like species, often with strange growths of their bodies that inhabit the planet of Marr. They operate under a hive mind, and some have the ability to clone themselves, while others can shackle the minds of their victims to do their bidding. Their main weapons are created through genetic engineering, thus they are gifted with biological weapons as well such as telepathic abilities. The Marro race reproduce asexually, despite the fact that their are female Marro as well.