The 1989–90 FIBA European Cup Winners' Cup was the twenty-fourth edition of FIBA's 2nd-tier level European-wide professional club basketball competition, contested between national domestic cup champions, running from 26 September 1989, to 13 March 1990.

It was contested by 21 teams, the same number of teams as the previous edition.

[1] Knorr Bologna defeated Real Madrid, in the final that was held in Florence, winning its first European-wide title.

It had previously lost the 1977–78 final against Gabetti Cantù.

March 13, PalaGiglio, Florence