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