Ormuzd, Or Ahura Mazda, the supreme deity of the ancient Persians. He is the god of the firmament, the representative of goodness and truth, and the creator of the universe and of the beneficent spirits who have charge of the well being of man and all created things. According to Zoroaster, an incomprehensible being named Zeruane Akerene (or Zrvan Akara-na, time without bounds), existed from all eternity; from him emanated primeval light, and from the latter sprang Ormuzd and Ahriman. Ahriman became jealous of his elder brother, and was condemned by the eternal one to pass 3,000 years in a region of utter darkness. On his release he created a number of bad spirits to oppose the spirits created by Ormuzd; and when the latter made an egg containing good genii, Ahriman produced another full of evil demons, and broke the two together, so that good and evil became mixed in the new creation. The two great opposing principles are called the king of light and the prince of darkness. Ormuzd is described as "sitting on the throne of the good and the perfect in regions of pure light," or as a venerable man seated on a bull, the emblem of creation.

A later doctrine, still professed by the Guebres and Par-sees, reduces Ormuzd from a great creator to a mere demiurge, or organizer of a universe previously created. (See Zend-Avesta).