Greek National Road 8a (, abbreviated as EO8a) was a toll road in the Attica, Peloponnese and West Greece regions. It connected Athens with the cities of Corinth and Patras. It was built in the 1960s as a replacement for the old National Road 8 as the major route to the Peloponnese, and bypasses most towns. The National Road 8a has gradually been upgraded to a motorway, the A8. Since April 2017, the complete length of the A8 motorway has been operational.