Nymphaion (Greek: Νυμφαῖον or Νύμφαιον) can refer to:

• Nymphaeum, a type of monument in Antiquity
• Nymphaeum, the name of Aristotle's Macedonian school at Mieza
• Nymphaeum (Olympia), the name of a structure for distributing water from an aqueduct to the entire site of ancient Olympia
• Nymphaion (fire sanctuary), the name given to the sanctuary of the eternal fire in Illyria
• Nymphaion (cave), a cave where worshipers of Pan went.

• Nymphaeum, alternate name of Daphne Mainomene, an ancient town on the Bosphorus
• Nymphaeum (Bithynia), a town on the Black Sea coast of ancient Bithynia
• Nymphaeum (Caria), an inland town of ancient Caria
• Nymphaeum (Cilicia), a town on the Mediterranean coast of ancient Cilicia
• Nymphaeum (Illyria), an ancient Greek colony in Illyria
• Nymphaion (Crimea), an ancient Greek colony in the Crimea
• Nymphaion (Ionia), an ancient Greek colony in western Anatolia
• Nymphaeum (Laconia), an ancient Greek town in Laconia
• Nymfaio, a village in Florina regional unit, Greece