Μαρούσι) alternately translated as Marousi, Amaroussi, or Amaroussion, is a professional basketball club that is based in Maroussi, a northern suburb of Athens, Greece.

It reached the Greek top division, the A National Category (Alpha League) in 1969, where it played for one season before being relegated.

Maroussi won the title of the European second-tier level FIBA Saporta Cup, during the 2000–01 season.

That team was coached by Vangelis Alexandris, and it featured the inside-outside scoring tandem of Jimmy Oliver and Ashraf Amaya, as well as the rebounding skills of Vassil Evtimov.

Coach Giannakis then left Maroussi in 2006, to concentrate on managing the senior men's Greek national basketball team.

However, they won the 3rd place playoff series against Aris, and thus qualified for the European top-tier level EuroLeague.

[6] The team was then only allowed to be registered to the top-tier level Greek Basket League's 2010–11 season on appeal.

By finishing in the top 5 in the Greek League, they qualified for the next season's edition of the European 2nd-tier level EuroCup, but they were not permitted to participate in the competition, due to financial issues.

In May 2011, Maroussi was ordered by FIBA's Basketball Arbitral Tribunal (BAT) to pay thousands of euros to former player Jared Homan in unpaid salaries and bonuses.

[9] Maroussi was unable to pay Homan, or Georgios Diamantopoulos, who won a similar ruling against the club in August of that year.

A temporary financial agreement with Homan, led to the suspension of the ban on registering any new players for one day, during which Frank Elegar was recruited to the club.

Nikos Linardos became the team's new head coach for the 2011–12 season, which began with a long losing streak, despite Maroussi player Nestoras Kommatos being one of the league's top scorers, and Maroussi player Ioannis Gagaloudis being one of the league's assists leaders.

The club was also prohibited from selling any tickets to home games, due to unpaid taxes, and it ceased paying its players and training staff.

[11] Due to going into bankruptcy, the club was then demoted to the third-tier level semi-professional competition, the Greek B League, for the 2012–13 season.

The club played its EuroLeague home games in Panathinaikos BC Arena which is Nikos Galis Olympic Indoor Hall.