In Norse mythology, Garmr is the dog associated with guarding the entrance to Hel. He appears in accounts of the underworld and is sometimes described as a monstrous hound connected with Ragnarök.
The sources do not present Garmr in exactly the same way in every passage. In the Poetic Edda, he is linked with Gnipahellir, a cave or passage near the realm of the dead, and is described as the best of hounds. At Ragnarök, Garmr breaks free and fights the god Týr, with both dying in the encounter.
Garmr is often compared with Fenrir, the giant wolf who kills Odin. Some scholars and retellings treat Garmr and Fenrir as overlapping figures, while other interpretations keep them separate. The surviving texts do not provide a completely consistent canine genealogy.
Garmr should also not be confused with Hel’s father, Loki, or with the wolf offspring associated with the sun and moon. His strongest mythic association is the boundary of the underworld.