The 2001–02 Euroleague was the second season of the professional basketball competition for elite clubs throughout Europe, organised by Euroleague Basketball Company, and it was the 45th season of the premier competition for European men's clubs overall. The season started on October 10, 2001, and ended on May 5, 2002.
41 teams in total with the qualification rounds, and 32 teams at the first group stage (the national domestic league champions from the best leagues, and a variable number of other clubs from the most important national domestic leagues), playing in a tournament system. The competition culminated in a Final Four.
The first phase was a regular season, in which the competing teams were drawn into four groups, each containing eight teams. Each team played every other team in its group at home and away, resulting in 14 games for each team in the first stage. The top 4 teams in each group advanced to the next round, The Top 16. The complete list of tiebreakers is provided in the lead-in to the Regular Season results.
If one or more clubs were level on won-lost record, tiebreakers were applied in the following order:
Head-to-head record in matches between the tied clubs
Overall point difference in games between the tied clubs
Overall point difference in all group matches (first tiebreaker if tied clubs were not in the same group)
Points scored in all group matches
Sum of quotients of points scored and points allowed in each group match
The remaining 16 teams were placed into four groups of four teams each. Each team played every other team in its group twice, once at home and once away. The top teams of each of the four groups advanced to the Final Four.