Peisistratos (ca 6th c. BCE – 527 or 528 BCE; also spelled Pisistratus) is a tyrant of Athens from 546 to 527/8 BCE.

His legacy lies primarily in his institution of the Panathenaic Festival and the consequent first attempt at producing a definitive version for Homeric epics.

Peisistratos' championing of the lower class of Athens, the Hyperakrioi, can be seen as an early example of populism or even socialism.

Peisistratid is the common term for the three tyrants who ruled Athens 546–510 BCE, namely Peisistratos and his two sons, Hipparchus and Hippias.