Elliniko (Greek: Ελληνικό, meaning 'Hellenic' or 'Greek') is a coastal municipality in the Attica region and a southern suburban town in the Athens agglomeration in Greece. Since the 2011 local government reform, it has been part of the municipality of Elliniko-Argyroupoli, of which it is a municipal unit. Elliniko is known for the former Hellinikon Olympic Complex, a temporary sporting complex building on the grounds of the former Ellinikon International Airport used for the 2004 Summer Olympics and the 2004 Summer Paralympics.
Elliniko is the site of a major development project for coastal Athens beginning in 2020 and due for completion in 2026—the Hellenikon Metropolitan Park, consisting of luxury homes, hotels, a casino, a marina, shops, offices, and Greece's tallest buildings such as the Riviera Tower and the Hard Rock Hotel & Casino Athens, which will be the first integrated resort in Greece.