PAOK, commonly known as A.C. PAOK, is a major multi-sports club based in Thessaloniki, Macedonia, Greece. The club has several departments, including football, basketball, volleyball, handball, water polo, swimming, wrestling, ice hockey, and weightlifting. P.A.O.K was founded in April 1926. Because of its crest, it is also known as the "Double-Headed Eagle of the North", in contrast with AEK, the "Double-Headed Eagle of the South". They are one of the most popular Greek sports-clubs with many fans all over the country, and also among the Greek diaspora.

The double-headed eagle is an iconographic symbol originating in the Bronze Age. A heraldic charge, it is used with the concept of an empire. Most modern uses of the emblem are directly or indirectly associated with its use by the late Byzantine Empire, originally a dynastic emblem of the Palaiologoi. It was adopted during the Late Medieval to Early Modern period in the Holy Roman Empire, Albania and in Orthodox principalities, representing an augmentation of the (single-headed) eagle or Aquila associated with the Roman Empire. In a few places, among them the Holy Roman Empire and Russia, the motif was further augmented to create the less prominent triple-headed eagle.