The Museum of Sikyon is housed in part of a Roman Balaneion (bathhouse) north of the Hellenistic and Roman agora. In 1935, Anastasios Orlandos excavated the monumental complex and restored four of the rooms, whose walls were preserved at a height of 4 m, in order to serve as an archaeological museum.

Courtyard

It has a display of architectural members, grave stelae and inscribed bases from monuments of Hellenistic, Roman and Early Christian Sikyon.

Room A

It contains architectural members from public buildings of the Hellenistic and Roman city. Also on display are fragments of statues and statuettes, mainly of gods and goddesses (either from the excavation of the bathhouse and the theatre, or chance finds), inscriptions and part of a mosaic floor from a house dating from the Classical period.

Room B

It is devoted to the sculpture of ancient Sikyon. It contains statuettes and votive reliefs of the Hellenistic and Roman period, and statues of officials and female figures of the Roman period. These finds come mainly from the bathhouse and the Gymnasium - Palaestra. Part of a mosaic floor from a house of the Classical period is also displayed in this room.

Room C

It contains grave offerings and grave markers from the cemeteries of Sikyon, dating from the Mycenaean to the Roman period. Also, on display here are figurines and objects from the cave of Pitsa, including lamps, examples of metalwork, and coins from both Sikyon and other cities. The centre of the room is dominated by a mosaic floor from a house of the Classical period.