The Norse god killed by the wolf Fenrir during Ragnarök is Odin.
In Norse mythology, Odin is the chief of the gods and a figure associated with wisdom, kingship, magic, poetry and war. During Ragnarök, the final series of cosmic battles and disasters, Fenrir breaks free from his bonds and swallows Odin.
Odin’s son Víðarr avenges him by killing Fenrir. This episode comes chiefly from sources such as the Poetic Edda and Snorri Sturluson’s Prose Edda, which were written down in medieval Iceland after the Viking Age. The surviving texts preserve older oral traditions but do not provide a single, uniform version of every myth.
Odin is sometimes confused with Týr in this story because Týr also loses a hand to Fenrir in an earlier myth. Thor, meanwhile, dies after killing the Midgard Serpent and succumbing to its poison, not to Fenrir.