Panionios B.C., known in European competitions as Panionios Athens is the Greek professional basketball club that is based in Nea Smyrni, and that plays its home games in Palaio Faliro, Greece. The club is also widely known as Πανιώνιος Γυμναστικός Σύλλογος Σμύρνης, or Panionios Gymnastikos Syllogos Smyrnis, which is the Pan-Ionian Gymnastic Club of Smyrna. This is usually abbreviated to the club name of Πανιώνιος Γ.Σ.Σ. Panionios B.C. is the basketball department of the Panionios Gymnastic Club that is based in Nea Smyrni.

Panionios G.S.S. Football Club, the Pan-Ionian Gymnastics Club of Smyrna, more commonly known as Panionios F.C. or simply Panionios, is a Greek football club based in Nea Smyrni, a suburban town in the Athens agglomeration, Greece. Part of Panionios G.S.S., Panionios F.C. is the oldest Greek football club.