Agios Vasileios () is a coastal village in the municipal unit of Rio, in the municipality of Patras. It is located on the Gulf of Corinth, 3 km northeast of Rio, Greece. The Greek National Road 8A (Patras - Corinth) passes south of the village.
Historical population
{| class="wikitable"
! Year !! Population
|-
| 1981 || 640
|-
| 1991 || 1,491
|-
| 2001 || 2,045
|-
| 2011 || 2,662
|-
| 2021 || 2,889
|}
See also
- List of settlements in Achaea
Gallery
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File:Agiosvasileios538.jpg|The beach of Agios Vasileios in Achaea, Greece
</gallery>
