Nymphaeum (Olympia) (Latin, Ancient Greek: νυμφαῖον), etymologically "home of the nymphs," or water goddesses, at ancient Olympia was the official name of a water-distribution structure constructed in the mid-2nd century at that site to provide water to the masses who attended the Olympic Games in July and August. Nymphaeum was the general name throughout the Mediterranean for an ornate structure that terminated an aqueduct bringing water from distant elevated terrain, say a stream or copious springs. This one had substructures, statues, and ornately patterned stonework; its main purpose, however, was functional. It received water from the aqueduct into a cistern and released it by stages into a system of open and closed channels leading around the site. The end partaker of the water carried a secular patera, or small drinking bowl, around with him, dipping into an open trough for the water, as is suggested by the fact that at least some of the statues carried such paterae in one hand (though they may also have been performing libations). Troughs went everywhere through the site to accommodate the crowds.

Olympia, officially Archaia Olympia, is a small town in Elis on the Peloponnese peninsula in Greece, famous for the nearby archaeological site of the same name. This site was a major Panhellenic religious sanctuary of ancient Greece, where the ancient Olympic Games were held every four years throughout Classical antiquity, from the 8th century BC to the 4th century AD. They were restored on a global basis in 1894 in honor of the ideal of peaceful international contention for excellence.