Panathinaikos B.C. (Greek: ΚΑΕ Παναθηναϊκός Α.Ο.), also known simply as Panathinaikos, or with its full name Panathinaikos BSA Athens, is the professional basketball team of the major Athens based multi-sport club Panathinaikos A.O.. It is owned by the billionaire Giannakopoulos family.

The parent athletic club was founded in 1908, while the basketball team was founded in 1922, being one of the oldest in the country. They are the only unrelegated team with participation in every First Division Championship until today (together with Aris BC). Panathinaikos has developed into the most successful basketball team in Greek basketball’s history, and among the best in Europe, creating its own dynasty. They have won 34 Greek Basket League Championships, 16 Greek Cups, 9 Doubles (all records), 6 Euroleague Championships, 1 Intercontinental Cup and 2 Triple Crowns. They hold also the record for the most consecutive Greek League titles, as they are the only team to have won 9 consecutive Championships (2003-2011), such as the record for the most consecutive Greek Basketball Cup titles (5 seasons from 2004 to 2009). The team plays in the O.A.C.A. Olympic Indoor Hall.

Among the well-known top class players that have played with the club over the years include: Fragiskos Alvertis, Edgar Jones, Antonio Davis, Nikos Galis, Stojko Vranković, Arijan Komazec, Alexander Volkov,Žarko Paspalj, Tiit Sokk, Panagiotis Giannakis, Dominique Wilkins, Fanis Christodoulou, Marcelo Nicola, Hugo Sconochini, Byron Dinkins, Byron Scott, Dino Rađa, Dejan Bodiroga, Oded Kattash, Ferdinando Gentile, Željko Rebrača, Antonis Fotsis, İbrahim Kutluay, Jaka Lakovič, Pepe Sánchez, Ariel McDonald, Kostas Tsartsaris, Mike Batiste, Dimitris Diamantidis, Nick Calathes, Vassilis Spanoulis, Dejan Tomašević,Sani Bečirovič, Ramūnas Šiškauskas, Tony Delk, Šarūnas Jasikevičius, Drew Nicholas, Jason Kapono, Jonas Mačiulis, Stéphane Lasme, Roko Ukić and Nikola Peković. Such players, the successful management of former long-time owners Pavlos Giannakopoulos and Thanassis Giannakopoulos, and the long-time guidance of the most successful coach in Euroleague history, Željko Obradović, have made Panathinaikos the most successful team in Europe over the last two-and-a-half decades.

Panathinaikos is the only team on the European continent to win as many as six Euroleague titles, since the establishment of the modern era Euroleague Final Four format in 1988 (no other club has won more than four Euroleague championships in this period). Overall, and on the basis of the club’s achievements, in both Greece and Europe, Panathinaikos BC is the most successful Greek team ever in the history of Greek sports.