Hippodamus of Miletos (or Hippodamos, Greek: Ἱππόδαμος ο Μιλήσιος) (498 BCE — 408 BCE) is an ancient Greek architect, urban planner, physician, mathematician, meteorologist and philosopher and is considered to be the “father” of urban planning, the namesake of Hippodamian plan of city layouts (grid plan).

He was born in Miletos and lives during the 5th century BC, in the spring of the Ancient Greece classical epoch.

His father was Euryphon.

His plans of Greek cities are characterized by order and regularity in contrast to the more intricate and confused layouts 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.