In Norse mythology, Þjazi (anglicized as Thiazi, Thjazi or Thiassi) was a giant. He was a son of giant Olvaldi, brother of giants Idi and Gangr and the father of giantess Skaði. His most notable misdeed was the kidnapping of the goddess Iðunn which is related in both the Prose Edda and the skaldic poem Haustlöng.
According to Skáldskaparmál, the gods Odin, Loki and Hœnir set out one day on a journey, traveling through mountains and wilderness until they were in need of food. In a valley they saw a herd of oxen, and they took one of the oxen and set it in an earth oven, but after a while they found that it would not cook. As they were trying to determine the reason for this, they heard someone talking in the oak tree above them, saying that he himself was the one responsible for the oven not cooking. They looked up and saw that it was Þjazi in the form of a great eagle, and he told them that if they would let him eat from the ox, then he would make the oven cook. To this they agreed, so he came down from the tree and began devouring a large portion of the meal. He ate so much of it that Loki became angry, grabbed his long staff and attempted to strike him, but the weapon stuck fast to Þjazi's body and he took flight, carrying Loki up with him. As they flew across the land Loki shouted and begged to be let down as his legs banged against trees and stones, but Þjazi would only do so on the condition that Loki must lure Idunn out of Asgard with her apples of youth, which he solemnly promised to do.
Later, at the agreed time, Loki lured Idunn out of Asgard into a forest, telling her he had found some apples that she might think worth having, and that she should bring her own apples with her to compare them. Þjazi then appeared in his eagle shape, grabbed Idunn and flew away with her to his realm of Þrymheimr, located in Jötunheimr.
The gods, deprived of Idunn's apples, began growing old and grey. When they learned that Idunn was last seen going out of Asgard with Loki, they threatened him with torture and death until he agreed to rescue her. Loki borrowed a magical coat from Freyja that would allow him to take the shape of a falcon, then flew to Jotunheim until he reached the hall of Þjazi. Finding Idunn alone while Þjazi was out to sea on a boat, Loki transformed her into a nut and carried her back, flying as fast as he could. When Þjazi returned home and discovered she was gone he assumed his eagle form and flew after Loki. When the gods saw Loki flying toward them with Þjazi right behind they lit a fire which burned Þjazi's feathers, causing him to fall to the ground where he was set upon and killed.
Þjazi's daughter Skadi then put on her war gear and went to Asgard to seek vengeance, but the gods offered her atonement and compensation until she was placated. She was also given the hand of Njord in marriage, and as a further reparation Odin took Þjazi's eyes and placed them in the night sky as stars.
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