Maroussi Saint Thomas Indoor Hall, or Maroussi Agios Thomas Indoor Hall, is an indoor sporting arena that is located in Marousi, Greece. The arena is only about 500 m (1,600 ft) away from the Athens Olympic Sports Complex, which is also known as the OAKA, and the Nikos Galis Olympic Indoor Hall. The arena is primarily used to host basketball games. The indoor hall is owned by the municipality of Maroussi. The seating capacity of the indoor basketball arena is 1,700 people.