In Norse mythology, Logi, Loge (Old Norse "fire") or Hálogi ("High Flame") is a fire giant, god and personification of fire. He is son of giant Fornjótr and brother of Ægir (sea giant) and Kári (god of the wind). Logi married fire giantess Glöð and she bore him two beautiful daughters—Eisa and Eimyrja.
Logi is often confused with Loki, another deity (this could have happened when Richard Wagner wrote his Ring des Nibelungen operas, in which Loki is a fire demigod (that is, not an áss) and the pun "Loge"/"Lohe" (i.e. Loki/blaze) also appears).
Logi appears by that name in Gylfaginning (Prose Edda) written by Snorri Sturluson in the tale of Thor and Loki's journey to the castle of the giant Útgarða-Loki in Jötunheimr where Loki was pitted against Logi in an eating contest. The contestants appeared to be equal in speed at eating meat from the bone, but Logi also consumed the bones and even the wooden trencher in which the meat was placed showing off his might. Útgarða-Loki afterwards explained that Logi was really wildfire itself.
In Flateyjarbók, there is a mention of Logi's family:
There was a man called Fornjót. He had three sons; one was Hlér, another Logi, the third Kári; he ruled over winds, but Logi over fire, Hlér over the seas.
The sons of Fornjótr are given powers to rule over forces of nature. Logi rules over fire.
Þorsteins saga Víkingssonar
In Þorsteins saga Víkingssonar, Logi, also called Hálogi, is identified as a Risi who becomes the first king of Hálogaland (northern Norway), and the ancestor of its royal line, all of whom are known for their muscular physique and stunning beauty.