In ancient Greek and Roman architecture, a peristyle is a continuous porch formed by a row of columns surrounding the perimeter of a building or a courtyard. Tetrastoön is a rarely used archaic term for this feature. The peristyle in a Greek temple is a peristasis (περίστασις). In the Christian ecclesiastical architecture that developed from the Roman basilica, a courtyard peristyle and its garden came to be known as a cloister.

Ancient Greek architecture came from the Greeks, or Hellenics, whose culture flourished on the Greek mainland, the Peloponnese, the Aegean Islands, and in colonies in Anatolia and Italy for a period from about 900 BC until the 1st century AD, with the earliest remaining architectural works dating from around 600 BC.