A peplos (Greek: ὁ πέπλος) is a body-length garment established as typical attire for women in ancient Greece by circa 500 BC, during the late Archaic and Classical period. It was a long, rectangular cloth with the top edge folded down about halfway, so that what was the top of the rectangle was now draped below the waist, and the bottom of the rectangle was at the ankle. One side of the peplos could be left open, or pinned or sewn together. In Latin and in a Roman context, it could be called a palla.

It should not be confused with the Ionic chiton, which was a piece of fabric folded over and sewn together along the longer side to form a tube. The Classical garment is represented in Greek vase painting from the 5th century BC and in the metopes of temples in Doric order.

Spartan women continued to wear the peplos much later in history than other Greek cultures. It was also shorter and with slits on the side causing other Greeks to call them phainomērídes (φαινομηρίδες), the "thigh-showers".