The ancient theatre of the city of Teos leans on a natural slope in the southeast of the Acropolis. It dates back to 2^nd century AD,  The structure follows Greek architectural style, with only some traces from Roman period. The theatre is composed of cavea, orchestra and scene. The cavea has two parts; the lower and upper ones. Built in Roman style, the lower levels have arch and vault. The stage building is 42 m long in east-west direction and 11m in north-south direction.