The ancient Persian name for the Zoroastrian supreme deity commonly called Ahura Mazda was Ahuramazda.
Ahuramazda is the Old Persian form of the name usually written in English as Ahura Mazda. Achaemenid royal inscriptions repeatedly invoke this deity as the source of kingship, victory, and order. Darius I famously states that Ahuramazda granted him the kingdom and helped him defeat rebellions.
The name means “Wise Lord” or “Lord Wisdom,” reflecting the deity’s association with truth, wisdom, and the ordered moral universe. In Zoroastrian tradition, Ahura Mazda is opposed by destructive forces associated with Angra Mainyu, often called Ahriman in later usage.
The spelling varies because the name passed through different languages and periods. Ahura Mazda is the standard modern scholarly form, while Ahuramazda reflects the ancient Persian royal inscription tradition.