The 2011–12 Eurocup Basketball season was the tenth edition of Europe's second-tier level transnational competition for men's professional basketball clubs, the EuroCup.

The winner of this competition earned a place at the group stage of the next season's EuroLeague.

[1] 32 teams participated in the Eurocup Regular Season: The labels in the parentheses show how each team qualified for the place of its starting round (TH: EuroCup title holders; FEC: FBIA EuroChallenge title holders): The eight winners of the qualifying round joined the regular season.

If teams were level on record at the end of the Regular Season, tiebreakers were applied in the following order: The quarterfinals were two-legged ties determined on aggregate score.

The group winners in each tie, listed as Team 1, hosted the second leg.