Azhi Dahaka is a demonic figure in the texts and mythology of Zoroastrianism, where he is one of the subordinates of Angra Mainyu.

Alternate names include Azi Dahak, Dahaka, or Dahak.

Azhi Dahaka is described as a three-headed, dragonlike monster. He is said to have a thousand senses, and to bleed snakes, scorpions, and other venomous creatures. He also is said to bring or control storms and disease. This dragon was defeated by the hero Thraetaona, but could not be killed; instead, he was imprisoned by being chained to the mountain Damavand.

It is further prophesized that Azhi Dahaka will break free of this prison as part of the Zoroastrian apocalypse, and will kill one-third of humanity before finally being slain by Keresaspa