Who was the god of fire in the Norse mythology?

Answer 1

There really was no Norse "god" of fire. There was Logi, who was of a race of sort of proto-giants who seems to have represented fire and whose name means "wildfire."

There was also Surtr (whose name means "black" or "blackened") who was leader of the Fire-Giants of Musphel (the Home of Fire), and who will destroy both the gods, the Frost Giants and pretty much the whole Universe with his flaming sword during the final battle of Ragnarok.

Finally, some people claim that Loki was a "god" of fire. This is mainly because his name is superfically close to Logi (That and people think a god of fire is cool.). But really his name is more closely related to Old Norse "lokka" -- meaning "to close, to lock, to end." Loki does have the same dual nature as fire (i.e. it can be very helpful, or very harmful), but anything beyond that is a stretch.

Actually Loki seems more closely related to lighning. E.g. He often accompanies Thor (the Thunderer) on travels; One of his other names is "the Air-Walker," and many Scandinavian folk traditions held that any instance of shimmering light was some manifestation of Loki.

Answer 2

Loki Laufeyson is the Norse god of fire as well as lies, mischeif and chaos.