Þjazi

thumb|Iðunn is carried off by Þjazi in this artwork by [[Harry George Theaker, 1920.]] thumb|He flapped away with her, magic apples and all (1902) by Elmer Boyd Smith.

In Norse mythology, Þjazi (Old Norse: ; anglicized as Thiazi, Thiazzi, Thjazi, Tjasse or Thiassi) was a jötunn. He was a son of the jötunn Ölvaldi, brother of Iði and Gangr, and the father of 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.