The Greek Motorway 5 (Greek: Αυτοκινητόδρομος 5; code: A5) is a motorway in Greece, partially still under construction. Upon completion, the motorway will be the second major north-south road connection in Motorway 1. It will also be part of the trans-balkanic Adriatic–Ionian motorway and the European routes E55 and E951.

The motorway's main section, commonly referred to as Ionia Odos (Greek: Ιονία Οδός), starts at Kakabia and it follows the western coastline of mainland Greece down to the Gulf of Corinth. At Rio, it crosses the gulf via the Rio–Antirrio bridge.

The southern section, commonly referred to as Olympia Odos (Greek: Ολυμπία Οδός), is fully located on the Peloponnese, attaching to the northern section at an interchange with the A8 Motorway near Patras and following the western coastline of the peninsula further down to Pyrgos. As of 2015, it is yet unknown if the future Patras - Pyrgos motorway will be part of the A5.

With the bypasses of Patras, Arta and Agrinio and the Rio–Antirrio bridge being completed by 2002, 2003 and 2009 respectively, the main section between Kakabia and Rio is expected to be put into operation by mid 2017. However, several sections might be put into operation earlier, probably with only one carriageway, until the other one is completed.

Odos is a commune in the Hautes-Pyrénées department in south-western France.

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