The Greek Motorway 8, is a motorway in Greece. Part of the Olympia Odos network, the motorway connects Athens with Patras in southwestern Greece, spanning a total of 215 km (134 mi).

Olympia Odos is a toll motorway system on the Peloponnese in Greece. Starting from Eleusis in the Athens metropolitan area, the Olympia Odos motorways follow the Gulf of Corinth to the Rio–Antirrio bridge and the city of Patras, and along the Ionian Sea coastline, in future down to Tsakona in the southwestern Peloponnese where it will intersect with the Moreas Motorway.