The Borisin are a canine species in Honkai: Star Rail. They are immortal werewolves, commonly gray or white with purple or blue markings, and normally wearing shackles. They are distantly related to Xianzhou Foxians.

They are Denizens of Abundance, blessed with immortality by the Aeon Yaoshi. During battle, they excrete a pheromone called Lupitoxin, which induces fear.