Fenrir often translated "Fenris-wolf", is a monstrous wolf in Norse mythology.

Due to the gods' knowledge of prophecies foretelling great trouble from Fenrir and his rapid growth, the gods bound him, and as a result Fenrir bit off the right hand of the god Tyr, also known as The God of War.

Depictions of Fenrir have been identified on various objects, and scholarly theories have been proposed regarding Fenrir's relation to other canine beings in Norse mythology.

Fenrir has been the subject of various artistic depictions, and he appears in most of Norse literature.