Panathinaikos Football Club (Greek: ΠΑΕ Παναθηναϊκός Α.Ο. [panaθinaiˈkos]), known as Panathinaikos, or by its full name, and the name of its parent sports club, Panathinaikos A.O. or PAO (Παναθηναϊκός Αθλητικός Όμιλος; Panathinaïkós Athlitikós Ómilos, "All-Athenian Athletic Club"), is a Greek professional football club based in Athens, Greece. According to research and polls, Panathinaikos is the second most popular football team in Greece, behind Olympiacos.