Olympia is a small town in Elis on the Peloponnese peninsula in Greece, famous for the nearby archaeological site of the same name, which was a major Panhellenic religious sanctuary of ancient Greece, where the ancient Olympic Games were held. The site was primarily dedicated to Zeus and drew visitors from all over the Greek world as one of a group of such "Panhellenic" centres which helped to build the identity of the ancient Greeks as a nation. Despite the name, it is nowhere near Mount Olympus in northern Greece, where the Twelve Olympians, the major deities of Ancient Greek religion, were believed to live.

The Olympic Games were held every four years throughout Classical antiquity, from the 8th century BC to the 4th century AD.

The archaeological site held over 70 significant buildings, and ruins of many of these survive, although the main Temple of Zeus survives only as stones on the ground. The site is a major tourist attraction, and has two museums, one devoted to the ancient and modern games.