Kouros is the modern term given to free-standing Ancient Greek sculptures that depict nude male youths. They first appear in the Archaic period in Greece and are prominent in Attica and Boeotia, with a less frequent presence in many other Ancient Greek territories such as Sicily. Such statues are found across the Greek-speaking world; the preponderance of these were found in sanctuaries of Apollo with more than one hundred from the sanctuary of Apollo Ptoion, Boeotia, alone. These free-standing sculptures were typically marble, but the form is also rendered in limestone, wood, bronze, ivory and terracotta. They are typically life-sized, though early colossal examples are up to 3 meters tall.

The sculpture of ancient Greece is the main surviving type of fine ancient Greek art as, with the exception of painted ancient Greek pottery, almost no ancient Greek painting survives. Modern scholarship identifies three major stages in monumental sculpture in bronze and stone: the Archaic, Classical (480–323) and Hellenistic. At all periods there were great numbers of Greek terracotta figurines and small sculptures in metal and other materials.