The Olympic Athletic Center of Athens Spiros Louis (Greek: Ολυμπιακό Αθλητικό Κέντρο Αθηνών "Σπύρος Λούης", Olympiakó Athlitikó Kéntro Athinón "Spýros Loúis") or OACA (OAKA)), is a sport facilities complex located at Marousi, in the north section of the city. The complex consists of five major venues as well as other supplementary sport facilities.

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Olympic Athletic Center of Athens

OACA
Full name	Olympic Athletic Center of Athens "Spiros Louis"
Location	Marousi, Athens. Greece
Owner	Greek Government
Construction
Renovated	2000–2004 (Olympic Games)
Architect	Santiago Calatrava (Revamping)
Website
https://oaka.com.gr/

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The Olympic Athletic Center of Athens has hosted the Mediterranean Games in 1991, the World Championship in Athletics in 1997 as well as other important athletic and cultural events. The most significant event the Athens Olympic Sports Complex has hosted, was the Olympic Games. OACA was the main venue for the Athens Olympic Games in 2004. The complex was revamped for the games under a design produced by the Spanish architect Santiago Calatrava.

The Athens Olympic Sports Complex can be reached by Metro [stations "Neratziotissa" and "Irini" of Metro Line 1 (Green Line)], by suburban train (Proastiakos station "Neratziotissa"), or by direct bus lines [A7 (Stournari – Kifissia), 602 (N. Ionia – Kalogreza – Panormou Metro Station), 550 (P. Faliro – Kifissia).

While it was reported in 2008 that almost all of the Olympic venues utilized for the 2004 games, including certain facilities in the Sports Complex such as the velodrome and tennis center, have fallen into varying states of dereliction or disrepair, all of the facilities in the Athens Olympic Sports Complex are still in use today.^[1]

The table below illustrates how the Athens Olympic Sports Complex facilities are used today: