The Temple of Olympian Zeus also known as the Olympieion or Columns of the Olympian Zeus, is a former colossal temple at the center of the Greek capital Athens. It was dedicated to “Olympian” Zeus, a name originating from his position as head of the Olympian gods.

The temple’s glory was short-lived, as it fell into disuse after being pillaged during a barbarian invasion in 267 AD, just about a century after its completion. It was probably never repaired and was reduced to ruins thereafter. In the centuries after the fall of the Roman Empire, it was extensively quarried for building materials to supply building projects elsewhere in the city. Despite that, a substantial part of the temple remains today, notably sixteen of the original gigantic columns, and it continues to be part of a very important archaeological site of Greece.

Today, the temple is an open-air museum, part of the unification of the archaeological sites of Athens. As a historical site it is protected and supervised by the Ephorate of Antiquities.