The competition began on 19 September 2017, with the qualifying rounds, and concluded on 6 May 2018, including 20 domestic champions.

The Final Four, which was held 4–6 May, was hosted at the Olympic Indoor Hall in Athens, Greece.

Hosts AEK Athens won their first Champions League title after defeating Monaco in the final.

[2] The labels in the parentheses show how each team qualified for the place of its starting round (TH: Basketball Champions League title holders; FEC: FIBA Europe Cup title holders): The schedule of the competition is as follows (all draws are held at the FIBA headquarters in Mies, Switzerland, unless stated otherwise):[3] The draw for the qualifying rounds was held on 11 July 2017, at the FIBA headquarters in Mies, Switzerland.

The draw for the regular season was held on 11 July 2017, at the FIBA headquarters in Mies, Switzerland.

Olympic Indoor Hall in Athens, Greece was announced as the venue of the 2018 Final Four.

[6] After each gameday a selection of five players with the highest efficiency ratings is made by the Basketball Champions League.