Agios Vasileios (Greek: Άγιος Βασίλειος meaning Saint Basil) is a village in the municipal unit of Tenea in Corinthia, Greece.

It is located about 25 km to the south of the city of Corinth, approximately halfway along the old national road to Argos (GR-7).

Sadly, agricultural work and forestry on Zygouries hill has destroyed one of the most important pre-historical settlements of the Balkans.

Recent archaeological excavations have uncovered a farmstead of a wealthy farmer with very beautiful mosaics in the area of Varella, northeast of Kleones.

The Frankish fortress, the ruins of which lie north of the village on Dafnias mountain overlooking the Chouni Pass, was built sometime between 1204 and 1250.

In 1377, Agios Vasilios (as Castello de Sancto Basile) is listed as one of the nine fortresses which existed in the Principality of Achaea.

On 26 July 1822 the Battle of Dervenakia (or Agios Sostis) took place, which saw the defeat and elimination of the Ottoman forces under Dramali.