National roads in Greece

National roads (Greek: Εθνική Οδός, romanized: Ethniki Odos) are a network of all-purpose trunk roads in Greece. They are less important than a motorway but more important than a provincial road. The layout of the national road network varies a lot, ranging from winding two-lane single carriageways to fast multi-lane dual carriageways: some of the latter are expressways (οδός ταχείας κυκλοφορίας, odos tacheias kykloforias) with motorway-like restrictions, but expressways in Greece are not limited to national roads.

The first known network of national roads in Greece was created in June 1928: the current network was defined in July 1963, and has been updated many times since then. Most national roads have route numbers that begin with "EO" in uppercase, non-continuously from EO1 to EO99, but most that were added later (such as Thessaloniki Inner Ring Road) have no number. Before the creation of the modern motorway network in July 1973, national roads were the most important type of roads for intercity travel in Greece.