Greek National Road 3

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National Road 3
Εθνική Οδός 3
Major junctions
South end	Eleusis
North end	North Macedonian border at Niki
Location
Country	Greece
Regions	Attica, Central Greece, Thessaly, West Macedonia
Major cities	Eleusis, Thebes, Lamia, Larissa, Kozani, Florina
Highway system
Highways in Greece Motorways National Roads

Greek National Road 3 (Greek: Εθνική Οδός 3, abbreviated as EO3) is a single carriageway road in Greece. It connects Elefsina near Athens with the border of North Macedonia at Niki. It passes through Larissa and Florina. At Niki, it connects with the M5K motorway to Bitola. The section Kozani - Niki is also designated as the A27 motorway, part of which is operational as a 2-lane motorway.

Greek National Road 3 is one of the longest national roads in Greece and until the 1960s it served as the main route from Larissa to Thessaloniki. The A1 motorway now offers a faster connection to Thessaloniki. Most of the EO3, except the southernmost section between Eleusis and Bralos, is part of the E65.