The Ancient Theatre of Epidaurus is a theatre in the Greek city of Epidaurus, located on the southeast end of the sanctuary dedicated to the ancient Greek God of medicine, Asclepius. It is built on the west side of Cynortion Mountain, near modern Lygourio, and belongs to the Epidaurus Municipality. Constructed in late 4th century BC, it is considered to be the most perfect ancient Greek theatre with regard to acoustics and aesthetics. Because of its exceptional architecture and aesthetics, the theatre was inscribed on the UNESCO World Heritage List in 1988 along with the Temple of Asclepius.

Epidaurus was a small city (polis) in ancient Greece, on the Argolid Peninsula at the Saronic Gulf. Two modern towns bear the name Epidavros: Palaia Epidavros and Nea Epidavros. Since 2010 they belong to the new municipality of Epidaurus, part of the regional unit of Argolis. The seat of the municipality is the town Lygourio. The nearby sanctuary and ancient theatre were inscribed on the UNESCO World Heritage List in 1988 because of their exemplary architecture and importance in the development and spread of healing sanctuaries and cults across the ancient Greek and Roman worlds.