Panellinios G.S., full name, Panellinios Gymnastikos Syllogos, is a Greek multi-sport club that is located in Athens and was founded in 1891. It is one of the oldest and more successful multi-sports clubs in Greece and also one of the oldest sports clubs in Europe.

Panathinaikos Athlitikos Omilos, also known simply as Panathinaikós, is a major Greek multi-sport club based in the City of Athens. Panathinaikos is one of the most successful multi-sport clubs and one of the oldest clubs in Greece. The name "Panathinaikos" was inspired by the ancient work of Isocrates Panathenaicus, where the orator praise the Athenians for their democratic education and their military superiority, which use it for benefit of all Greeks.