| Tourney Name: | European Cup Winners' Cup |
| Year: | 1990–91 |
| Dates: | 19 August 1990 – 15 May 1991 |
| Num Teams: | 33 |
| Champion Other: | Manchester United |
| Count: | 1 |
| Second Other: |  Barcelona |
| Matches: | 63 |
| Goals: | 160 |
| Attendance: | 1112484 |
| Top Scorer: | Roberto Baggio (Juventus) 9 goals |
| Prevseason: | 1989–90 |
| Nextseason: | 1991–92 |
The 1990–91 season of the European Cup Winners' Cup was won by Manchester United against Barcelona. The victory for United was significant as it was the season English clubs returned to European football, after completing a five-year ban as a result of the Heysel Stadium disaster.
A total of 33 teams participated in the competition. Yugoslav Cup winners Red Star Belgrade won the double, and cup runners-up Hajduk Split were disqualified, so no representative of Yugoslavia participated.
Notes|-|}
Trabzonspor won 3–1 on aggregate.
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† Order of legs reversed after original draw
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Aberdeen won 5–0 on aggregate.----Legia Warsaw won 6–0 on aggregate.----Olympiacos won 5–1 on aggregate.----Sampdoria won 2–1 on aggregate.----Manchester United won 3–0 on aggregate.----Wrexham won 1–0 on aggregate.----Montpellier won 1–0 on aggregate.----Steaua București won 6–1 on aggregate.----Dynamo Kyiv won 6–2 on aggregate.----Dukla Prague won 4–1 on aggregate.----Fram won 4–1 on aggregate.----Barcelona won 7–3 on aggregate.----RFC Liège won 5–0 on aggregate.----2–2 on aggregate. Estrela da Amadora won 4–3 on penalties.----Austria Wien won 2–0 on aggregate.----Juventus won 8–1 on aggregate.
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Legia Warsaw won 1–0 on aggregate.----Sampdoria won 4–1 on aggregate.----Manchester United won 5–0 on aggregate.----Montpellier won 8–0 on aggregate.----Dynamo Kyiv won 3–2 on aggregate.----Barcelona won 5–1 on aggregate.----RFC Liège won 2–1 on aggregate.----Juventus won 8–0 on aggregate.
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Manchester United won 3–1 on aggregate.----Legia Warsaw won 3–2 on aggregate.----Barcelona won 4–3 on aggregate.----Juventus won 6–1 on aggregate.
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Manchester United won 4–2 on aggregate.----Barcelona won 3–2 on aggregate.
See main article: 1991 European Cup Winners' Cup Final.
The top scorers from the 1990–91 European Cup Winners' Cup are as follows:
