The Greek C Basket League, or Greek C Basketball League (Greek: Ελληνική Γ Μπάσκετ Λιγκ) is the national fourth-tier level of the basketball league system in Greece. It is also known as the Third National Championship, C National Championship, Third National League, C National League, and Fourth Division, or in Greek, Γάμμα Εθνική καλαθοσφαίρισης (Gamma Ethniki Basketball). It is organized by the Hellenic Basketball Federation (E.O.K.).