Argyrokastro (Greek: Αργυρόκαστρο, "silver castle") is a castle in the region of the Peloponnese, Greece. It is located in mountainous Arcadia, near the village of Magouliana, at an elevation of 1,450 m. It is also known as the Gortyniako dynamari (Γορτυνιακό δυναμάρι, "Gortynian stronghold").