G.S. Olympia Larissa B.C. (alternate spelling: Olimpia) (Greek: Γ.Σ. Ολύμπια Λάρισας) is a Greek professional basketball club that is based in Larissa, Greece. The club's full name is Gymnastikos Syllogos Olympia Larissa Basketball Club. It was founded in 1979, making it one of the youngest sports clubs in Greece. Its colors are orange and green. Olympia Larissa's home arena is the Larissa Neapolis Arena. In 2009, the club merged with A.E.L. 1964 B.C..
Olympia Larissa is a team composed of young players on the rise with a promising future. In the 2007-08 season of the Greek League, Olympia qualified for the playoffs for the second consecutive year, placing 8th in regular season. In the 2007-08 season of the EuroCup the team reached the stage of the Top 16 and that same season in the Greek Cup the club reached the quarter-finals.