Olympiacós Sýndesmos Filáthlon Peiraiós is a major multi-sport club based in Piraeus, Greece. Olympiacos is parent to a number of different competitive departments which participate in football, basketball, volleyball, water polo, handball, athletics, swimming, table tennis and boxing amongst many others—and have won numerous European and domestic titles over the club's history.

Piraeus is a port city within the Athens urban area, in the Attica region of Greece. It is located eight kilometres (5 mi) southwest of Athens' city centre along the east coast of the Saronic Gulf in the Athens Riviera.