The Hellinikon Olympic Complex is a closed, partially demolished sports complex, situated at Elliniko, a suburban town in the southern part of the Athens urban agglomeration, approximately 16 kilometres from the Olympic Village. It was built on the site of the former Hellinikon International Airport for the staging of the 2004 Summer Olympics and 2004 Summer Paralympics. It consists of five separate venues.

Ellinikon International Airport (IATA: ATH, ICAO: LGAT), sometimes spelled Hellinikon, was an international airport that served Athens, Greece, for 63 years. Following its closure on 28 March 2001, it was replaced in service by the new Athens International Airport Eleftherios Venizelos. The airport was located 7 kilometres (4.3 mi) south of Athens, and just west of Glyfada. It was named after the village of Elliniko, now a suburb of Athens. The airport had an official capacity of 11 million passengers per year, but served 13.5 million passengers during its last year of operations. A large portion of the site was converted into a stadium and sports facilities for the 2004 Olympic Games.