1990–91 FIBA European Cup Winners' 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.
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.Participants
First round
Top 16
Quarterfinals
Group A
| Team | Pld | Pts | W | L | PF | PA | PD |
| 1. |  Dynamo Moscow | 6 | 10 | 4 | 2 | 549 | 511 | +38 |
| 2. |  Pitch Cholet | 6 | 10 | 4 | 2 | 562 | 510 | +52 |
| 3. |  Knorr Bologna | 6 | 10 | 4 | 2 | 517 | 509 | +8 |
| 4. |  Ovarense | 6 | 6 | 0 | 6 | 430 | 528 | -98 |
Group B
| Team | Pld | Pts | W | L | PF | PA | PD |
| 1. |  CAI Zaragoza | 6 | 10 | 4 | 2 | 593 | 571 | +22 |
| 2. |  PAOK | 6 | 9 | 3 | 3 | 528 | 500 | +28 |
| 3. |  Hapoel Galil Elyon | 6 | 9 | 3 | 3 | 546 | 560 | -14 |
| 4. |  Crvena zvezda | 6 | 8 | 2 | 4 | 593 | 629 | -36 |
Semifinals
Final
March 26, Patinoire des Vernets, Geneva
