Agios Konstantinos is a village in West Achaea Municipality, in the regional unit of Achaea, in the region of West Greece, Greece. Agios Konstantinos lies 0.9 km from the Peloponnese mountains. It has 54 inhabitants (2021). The nearest city is Patras, 36 km to the northeast. Beaches nearby: Falari (13 km), Brinia (13 km), Kounoupeli (14 km). Among the landmarks around are Elis (15.0 km), Olympia (44 km) and Dyme (17.1 km).

Also written Άγιος Κωνσταντίνος.