Agios Nikolaos is a village in Kalavryta Municipality, in the regional unit of Achaea, in the region of West Greece, Greece. Agios Nikolaos lies in the Aroania (mountain) mountains, on the Peloponnese peninsula. It has 77 inhabitants (2021). The nearest city is Tripoli, 48 km to the southeast. Among the landmarks around are Orchomenus (24 km), Agia Lavra (13.8 km) and Mantinea (38 km). Among the natural features are Cave of the Lakes (6.2 km).
Also written Άγιος Νικόλαος.