| Tourney Name: | European Cup Winners' Cup |
| Year: | 1965–66 |
| Champion Other: | Borussia Dortmund |
| Count: | 1 |
| Second Other: | Liverpool |
| Matches: | 59 |
| Goals: | 188 |
| Prevseason: | 1964–65 |
| Nextseason: | 1966–67 |
The 1965–66 season of the European Cup Winners' Cup club football tournament was won by Borussia Dortmund in an extra-time final victory over Liverpool at Hampden Park in Glasgow. This season of the Cup Winners' Cup was the first instance of the away goals rule being applied in football history.
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Olympiakos won 2–1 on aggregate.----Știința Cluj won 3–0 on aggregate.----Dynamo Kiev won 10–1 on aggregate.----Liverpool won 2–1 on aggregate.----CSKA Cherveno Zname won 4–1 on aggregate.----AGF won 4–2 on aggregate.
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Atlético Madrid won 6–0 on aggregate.----Dynamo Kiev won 6–1 on aggregate.----West Ham United won 6–2 on aggregate.----Borussia Dortmund won 5–4 on aggregate.
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Celtic won 4–1 on aggregate.----West Ham United won 2–1 on aggregate.
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Borussia Dortmund won 5–2 on aggregate.----Liverpool won 2–1 on aggregate.
See main article: 1966 European Cup Winners' Cup Final.