Maroussi Indoor Hall AKA Agios Thomas Indoor Hall is an indoor basketball sporting arena that is located in the city of Maroussi, Greece, a suburb that is 9 km north of the center of the city of Athens, Greece. The stadium is only about 500m distance away from the Athens Olympic Sports Complex also known as the OAKA. The seating capacity of the indoor basketball arena is 2,500 people. It is currently home to the Maroussi Athens Greek basketball team, which competes in the Greek A1 League.
The arena was opened in the year 1998, when Maroussi was most recently promoted to the Greek A1 League. The hall is owned by the city of Maroussi. Currently, there are plans underway to expand the arena and increase its seating capacity to 3,500 in the near future, in order to meet the new Greek League arena standards.