|Summary:||Hellenistic theater; on the northwestern side of the Sanctuary of Amphiaraios, behind the west half of the stoa.|
|Date:||ca. 200 BC|
Earth cavea with 5 marble thrones, circular orchestra, and a two-storied scene building with stone proscenium having 8 Doric columns in antis.
The proscenium architrave was inscribed with a dedication to Amphiaraios from a priest. The cavea may have had wooden seats. In the Roman period gateways with Ionic columns were added to the parodoi. The present proscenium has been reconstructed.