Panathinaikos F.C. (Greek: ΠΑΕ Παναθηναϊκός Α.Ο.), also known simply as Panathinaikos, or with its full name Panathinaikos A.O. (Greek: Παναθηναϊκός Αθλητικός Όμιλος, transliterated "Panathinaikos Athlitikos Omilos", Panathenaic Athletic Club) are a Greek professional football club based in the City of Athens. Panathinaikos can literally be translated as "Panathenaic", which means "of all Athens". The name "Panathinaikos" was inspired by the ancient work of Isocrates Panathenaicus, where the orator praise the Athenians for their democratic education and their military superiority, which use it for benefit of all Greeks. Today a part of Panathinaikos A.O., they are the oldest active football club in Greece founded just for football. Created in 1908 as "Podosfairikos Omilos Athinon" (Football Club of Athens), they play in the Super League Greece are one of the most successful clubs in Greek football and is one of three clubs which have never been relegated from the top division. They have won 20 Greek Championships, 18 Greek Cups, 4 Greek Super Cups and 8 Doubles. They are the only club that have won a championship without a loss in a top-flight campaign (1964). Panathinaikos is also the most successful Greek club in terms of achievements in the European competitions. It is the only Greek team that has reached the European Cup (later changed to UEFA Champions League) final in 1971, and also the semi-finals twice, in 1985 and 1996. It is also the only Greek team that has played for the Intercontinental Cup (1971). Furthermore, they have reached the quarter-finals of UEFA Champions League two more times (in 1992 and 2002) and also the quarter-finals of UEFA Cup twice (in 1988 and 2003). They have won also once the Balkans Cup in 1977. Panathinaikos is a member of the European Club Association. Since the 50s', the club maintains some of the oldest and most successful academies in Greece producing and preparing new footballers for the first team and feeding also the Greek national football team. Panathinaikos F.C. became professional and independent in 1979. They have played their home games in the Apostolos Nikolaidis Stadium – which is considered as their traditional home ground – and the Athens Olympic Stadium. According to the vast majority of researches and polls, it is the second most popular football team in Greece with the difference behind Olympiacos to be varied between 1% to 6,5% and the difference in front of the third to be fluctuated between 17% to 21% among the fans. The club has million of fans inside Greece and millions of others in the Greek communities all over the world. Panathinaikos FC currently is the only supporter-owned football club in Greece. They hold a long-term rivalry with Olympiacos and matches between the two teams are referred to as "Derby of the eternal enemies".

Panathinaikos B.C. (Greek: ΚΑΕ Παναθηναϊκός), also known simply as Panathinaikos, currently also known as Panathinaikos AKTOR Athens for sponsorship reasons, is the professional basketball team of the major Athens-based multi-sport club Panathinaikos A.O. It is owned by the Giannakopoulos family. The parent athletic club was founded in 1908, while the basketball team was created in 1919, being one of the oldest in Greece. Alongside Aris, they are the only un-relegated teams with participation in every Greek First Division Championship until today. Panathinaikos has developed into the most successful basketball club in Greek basketball's history, and one of the most successful in European basketball, creating its own dynasty. They have won seven EuroLeague Championships, forty Greek Basket League Championships, twenty Greek Cups, one Intercontinental Cup, one Greek Super Cup and two Triple Crowns. They also hold the record for most consecutive Greek League titles, as they are the only team to have won nine consecutive championships (2003–2011), as well as for the most consecutive Greek Basketball Cup titles, winning six from 2012 to 2017. Panathinaikos counts one more championship that took place in 1921 and was organized by the YMCA. It is however not recognized by the Hellenic Basketball Clubs Association, as it was before the creation of the Hellenic Basketball Federation. The team plays its home games in the O.A.C.A. Olympic Indoor Hall, which has a maximum capacity of 19,250 for basketball games. Panathinaikos also holds the world record for the longest title-winning streak, spanning 27 seasons, starting in 1995–96 and continuing up until 2021–22. Over these 27 years, Panathinaikos have won at least one title each season and 43 titles overall. Among the numerous well-known top class players who have played with the club over the years are Dominique Wilkins, Fragiskos Alvertis, Byron Scott, Nick Galis, John Salley, Dimitris Diamantidis, Antonio Davis, Stojko Vranković, Dino Rađja, Šarūnas Jasikevičius, Dejan Bodiroga, Oded Kattash, Ramūnas Šiškauskas, Panagiotis Giannakis, Fanis Christodoulou, Alexander Volkov, Marcelo Nicola, Hugo Sconochini, Željko Rebrača, Antonis Fotsis, İbrahim Kutluay, John Amaechi, Nikola Peković, Jaka Lakovič, Pepe Sánchez, Kostas Tsartsaris, Mike Batiste, Nick Calathes, Vassilis Spanoulis, Dejan Tomašević, Byron Dinkins, Ferdinando Gentile, Sani Bečirovič, Darryl Middleton, Lazaros Papadopoulos, Žarko Paspalj, Nikos Chatzivrettas, Dimos Dikoudis, Tiit Sokk, Sofoklis Schortsanitis, Jason Kapono, Arijan Komazec, Edgar Jones, Romain Sato, Johnny Rogers, Tony Delk, Drew Nicholas, Stéphane Lasme, Roko Ukić, Robertas Javtokas, Jonas Mačiulis, Ioannis Bourousis, James Gist, Keith Langford, Jimmer Fredette, Kostas Sloukas and Kendrick Nunn. Such players, the successful management of former long-time presidents Pavlos Giannakopoulos and Thanasis Giannakopoulos, as well as the long-time guidance of the most successful coach in EuroLeague history, Željko Obradović, turned Panathinaikos into 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 seven EuroLeague titles (1996, 2000, 2002, 2007, 2009, 2011 and 2024), 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). They were also EuroLeague runners-up in 2001. They reached the EuroLeague Final Four twelve times altogether (1994, 1995, 1996, 2000, 2001, 2002, 2005, 2007, 2009, 2011, 2012, 2024).