Olympiacos F.C., known simply as Olympiacos or Olympiacos Piraeus, is a Greek professional football club based in Piraeus. Part of the major multi-sport club Olympiacos CFP, their name was inspired from the ancient Olympic Games and along with the club's emblem, the laurel-crowned Olympic athlete, symbolize the Olympic ideals of ancient Greece. Their home ground is the Karaiskakis Stadium, a 33,334-capacity stadium in Piraeus.

The Georgios Karaiskakis Stadium, commonly referred to as the Karaiskakis Stadium, is a football stadium in Piraeus, Attica, Greece, and the home ground of the Piraeus football club Olympiacos. It is named after Georgios Karaiskakis, a military commander and national hero of the Greek War of Independence, who was mortally wounded in the area.