Panionios G.S.S. (Greek: Πανιώνιος Γυμναστικός Σύλλογος Σμύρνης, "Panionios Gymnastikos Syllogos Smyrnis"), the "Pan-Ionian Gymnastics Club of Smyrna", is a Greek multi sport club founded in 1890. Originally based in Smyrna/Izmir, the club was uprooted in the population exchange between Greece and Turkey following the Asia Minor Catastrophe in 1922. It is now based in the Athenian suburb of Nea Smyrni, (New Smyrna) in Greece, where many of the refugees from Smyrna settled.