| 1990–91 FIBA European Cup Winners' Cup | |
| League: | FIBA European Cup Winners' Cup |
| Sport: | Basketball |
| Finals: | Finals |
| Finals Link: | 1990–91 FIBA European Cup Winners' Cup Finals |
| Finals Champ: | PAOK |
| Finals Runner-Up: |  CAI Zaragoza |
| Seasonslistnames: | FIBA European Cup Winners' Cup |
| Prevseason Link: | 1989–90 FIBA European Cup Winners' Cup |
| Prevseason Year: | 1989–90 |
| Nextseason Year: | 1991–92 |
| Nextseason Link: | 1991–92 FIBA European Cup |
The 1990–91 FIBA European Cup Winners' Cup was the twenty-fifth edition of FIBA's 2nd-tier level European-wide professional club basketball competition, contested between national domestic cup champions, running from 25 September 1990, to 26 March 1991. It was contested by 19 teams, two less than the previous edition.[1]
PAOK defeated CAI Zaragoza, in the final that was held in Geneva, winning its first European-wide title ever. It was the second Greek League club that won the FIBA Cup Winners' Cup, after AEK Athens won in the distant 1967–68 season.
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| Top two places in each group advance to semifinals |
Group A
| Group B
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March 26, Patinoire des Vernets, Geneva|}
