Beyond the City Gate the Decumanus Maximus begins. Fifty meters up this street there is the entrance to the theatre. Unfortunately little more than the semi-circular seating survives. It is rather difficult to get an idea of a typical Graeco-Roman building from its present condition. The blocks of the cavea (auditorium), diazoma (dividing corridor of the auditorium), kerkidai (climbing steps), entrances and the orchestra have been carried away for later period constructions in Antioch and in Yalvaç. Arundell observed that many blocks had been removed when he identified the theatre in 1833.
The theater was built on a west-facing slope. It is a small theater with a capacity of approximately 5000 people. The theater has two caveas with single diazoma (horizontal corridor that divides the cave) and most of the seats of the upper cavea are missing and the structure is in a quite poor condition. The theater, which has entrances (parados) from the north and south, was closed by laying the southern entrance (its parados) on Decumanus Street in the late period. In the Hellenistic period, the theater's round planned orchestra was transformed into a semi-circle with the stage building built during the Roman Imperial Period.
Only the basic sequence of the stage building could be preserved. The facade of the building, which was built in a rectangular form, was decorated with a frieze of bull heads carrying girland. (Friezes are exhibited in Yalvaç Museum garden.) The subsequent uplifting of the walls surrounding the orchestra with reused material shows that wild animals and gladiator games were played in the theater in the Late Periods. The gladiator reliefs in the city are in Yalvaç Museum. With the repairs and additions, the theater was used until late periods.