Autokratōr (, plural: , lit. "self-ruler", "one who rules by himself", from αὐτός and κράτος) is a Greek epithet applied to an individual who exercises absolute power, unrestrained by superiors. In a historical context, it has been applied to military commanders-in-chief, and to Roman and Byzantine emperors as the translation of the Latin title imperator. Its connection with Byzantine-style absolutism gave rise to the modern terms autocrat and autocracy. In modern Greek, it means "emperor", and the female form of the title is autokrateira (, "empress").

Autokratōr (, plural: , lit. "self-ruler", "one who rules by himself", from αὐτός and κράτος) is a Greek epithet applied to an individual who exercises absolute power, unrestrained by superiors. In a historical context, it has been applied to military commanders-in-chief, and to Roman and Byzantine emperors as the translation of the Latin title imperator. Its connection with Byzantine-style absolutism gave rise to the modern terms autocrat and autocracy. In modern Greek, it means "emperor", and the female form of the title is autokrateira (, "empress").