The Hellenic Navy (HN; Greek: Πολεμικό Ναυτικό) is the naval force of Greece, part of the Hellenic Armed Forces. The modern Greek navy historically hails from the naval forces of various Aegean Islands, which fought in the Greek War of Independence. During the periods of monarchy (1833–1924 and 1936–1973) it was known as the Royal Hellenic Navy (Βασιλικόν Ναυτικόν).

The Hellenic Navy is a Green-water navy. The total displacement of the fleet is approximately 150,000 tons and it is the 22nd largest navy in the world by total number of vessels. The HN also operates a number of naval aviation units.