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 (near Meligalas) in the southwestern Peloponnese where it will intersect with the Moreas Motorway.

Olympia Odos consists of two highways:

• The A8 motorway (Athens – Patras), constructed in 1962–1973 as National Road 8α. During the 1990s the Elefsina – Corinth section was upgraded to motorway standards. The Corinth – Patras upgrade to motorway standards was completed in April 2017.
• The Patras – Pyrgos motorway, designated as motorway A5, which passes by the namesake ancient city of Olympia. This motorway is currently in planning stages.