The 2019–20 season was the 66th appearance in the top-tier level Greek Basket League for Aris Thessaloniki. The season and ended prematurely in March 2020, due to the COVID-19 pandemic. Aris Thessaloniki was in the 13th place and was going to be relegated. On 21 May 2020, after a vote that was held between the league's 14 teams, Panathinaikos OPAP was crowned the league's champion and none of the teams would be relegated. The club also competed in the Greek Basketball Cup and eliminated by Iraklis in Phase 2. The game held in Nick Galis Hall.