Including the competition's previous incarnation as the FIBA Europe Champions Cup, this was the 63rd season of the premier basketball competition for European men's clubs.

The season started on 3 October 2019 and played its last games on 6 March 2020 due to the COVID-19 pandemic.

On 12 March 2020, Euroleague Basketball temporarily suspended its competitions due to the COVID-19 pandemic.

On 5 July 2018, Euroleague Basketball agreed expand the competition to 18 teams, with the allocation of two-year wild cards to German Bayern Munich and French LDLC ASVEL.

[5] The labels in the parentheses show how each team qualified for the place of its starting round:[4][5][6] Source: EuroLeagueNotes:1: 2018–19 season average applied to EuroCup games.2: CSKA Moscow played one match at Universal Sports Hall CSKA and two at Yantarny Sports Palace, instead of Megasport Arena.3: Zenit Saint Petersburg played two matches at Yubileyny Sports Palace and one at Basket-Hall Kazan, instead of Sibur Arena.4: Panathinaikos OPAP, Valencia Basket and AX Armani Exchange Milan played one match behind closed doors, not included in the averages.5: Crvena zvezda mts played three matches at Aleksandar Nikolić Hall, instead of Štark Arena.