Hippodamus of Miletus (/hɪˈpɒdəməs/; Greek: Ἱππόδαμος ὁ Μιλήσιος, Hippodamos ho Milesios; 498 – 408 BC), was an ancient Greek architect, urban planner, physician, mathematician, meteorologist and philosopher and is considered to be the "father of European urban planning", the namesake of the "Hippodamian plan", or grid plan, of city layout.
Hippodamus was born in Miletus and lived during the 5th century BC, on the spring of the Ancient Greece classical epoch. His father was Euryphon. According to Aristotle, Hippodamus was the first author who wrote upon the theory of government, without any knowledge of practical affairs.
His plans of Greek cities were characterised by order and regularity in contrast to the intricacy and confusion common to cities of that period, even Athens. He is seen as the originator of the idea that a town plan might formally embody and clarify a rational social order.