Angra Mainyu or Ahriman is the Avestan name of Zoroastrianism's hypostasis of the "destructive/evil spirit" and the main adversary in Zoroastrianism either of the Spenta Mainyu, the "holy/creative spirits/mentality", or directly of Ahura Mazda, the highest deity of Zoroastrianism. The Middle Persian equivalent is Ahriman 𐭠𐭧𐭫𐭬𐭭𐭩. The name can appear in English-language works as Ahrimanes.

Ahura Mazda, also known as Oromasdes, Ohrmazd, Ormazd, Ormusd, Hoormazd, Harzoo, Hormazd, Hormaz and Hurmuz, is the creator deity and god of the sky in the ancient Iranian religion Zoroastrianism. He is the first and most frequently invoked spirit in the Yasna. The literal meaning of the word Ahura is "lord", and that of Mazda is "wisdom".