Greek National Road 8 (Greek: Εθνική Οδός 8, abbreviated as EO8, common name: old Athens-Patras national road) is a single carriageway with at-grade intersections in the Attica, Peloponnese and West Greece regions. It connects Athens with the cities of Corinth and Patras. Since the 1960s it has been replaced for most of its length with the National Road 8A, a limited-access toll road that bypasses most towns, as the major route to the Peloponnese. The National Road 8A is gradually being upgraded to a motorway, the Olympia Odos (A8).
National Road 8 passes along the northern coast of the Saronic Gulf, through the Isthmus of Corinth and further, along the southern coast of the Gulf of Corinth, and ending in downtown Patras. It runs through five regional units: Central Athens, West Athens, West Attica, Corinthia and Achaea. Since the opening of National Road 8A it is mainly used for local traffic in the coastal towns.
National Road 8 passes through or along the following towns:
Coordinates: 38°01′05″N 22°44′25″E / 38.0181°N 22.7402°E