Schiza (Greek: Σχίζα) is a Greek island off the southwestern coast of the Peloponnese. According to 2011 census, the island is uninhabitants. Administratively it is part of the municipality of Methoni in Messenia. It is the largest island of the Messenian Oinousses, an island complex that consists of two main islands (Schiza and Sapientza) and few rocky islets. Its area is 12.3 Km².