The ancient theater of Argos is the leading cultural monument of Argos, located in a central part of the city, southeast of Larissa hill, and extends directly opposite the ancient market of Argos.

Constructed by Polykleitos at the end of the 5th century BC, the ancient theater of Argos is considered an architectural achievement, as about a third is carved into natural rock.

With a capacity of about 20,000 spectators in its heyday, the ancient theater of Argos is one of the largest ancient theaters in the Greek world, hosting musical and dramatic games of Nemean, as well as games in honor of the goddess Hera, while during the Roman times that were performed in honor of the emperor.

The ancient theater of Argos consisted of the hollow of the spectators and the orchestra of the performances. The hollow had 89 rows of seats, which were divided into three four-section diagrams, the stands. The main docks, intended for officials, were also carved into the rock, with the rest consisting of stone structures and built on dirt.

The orchestra of the ancient theater of Argos had a diameter of 26.68 meters, and it was surrounded by a pipeline to remove water in the event of a flood. Its floor was made of limestone slabs, thus forming a circle, on which the two corridors or lanes were connected. The foreground consisted of 20 columns, opening towards the orchestra and behind it the stage.

From the 2nd century AD, the ancient theater of Argos was adorned in the Roman model, while fences (in the case of duels), shelters (for the sun), and new stables for the officials appeared on the course until it ceased to function in the 5th-6th century. AC.

To the north of the ancient theater of Argos, you can visit the ancient waterworks of Argos or the Nymphaeum. To the east, it meets the Criterion, the ancient court of the city, while the path to the north ends at the Hadrian Aqueduct.