The A5 motorway, also known as the Ionia Odos (Greek: Ιόνια Οδός), is a controlled-access highway in western Greece, which starts at Ioannina 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 and is connected with the A8 at an interchange near Patras. The Patras - Pyrgos section of the motorway is now considered part of the A8 motorway and will eventually extend to Tsakona near Kalamata. Another extension north to Kakavia at the border with Albania, is in the planning stage.
In August 2017, the last section under construction (Perdika-Ioannina) was completed and delivered to traffic by the Greek Minister of Infrastructure, Transport and Network, making Ionia Odos a fully operational motorway. It is the second major north–south road connection after the A1 motorway and is also part of the trans-balkanic Adriatic–Ionian motorway and the European routes E55 and E951.