Agios Konstantinos is a village in Patras Municipality, in the regional unit of Achaea, in the region of West Greece, Greece. Agios Konstantinos lies in the Panachaiko mountains, on the Peloponnese peninsula. It has 364 inhabitants (2021). The nearest city is Patras, 7.9 km to the northwest. Beaches nearby: Plaz (11 km). Among the landmarks around are Apollon Theatre (7.7 km), Cathedral of Saint Andrew (7.6 km) and Rio–Antirrio Bridge (15.5 km).
Also written Άγιος Κωνσταντίνος.
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