| Tourney Name: | European Cup Winners' Cup |
| Year: | 1983–84 |
| Dates: | 14 September 1983 – 16 May 1984 (competition proper) |
| Num Teams: | 33 |
| Champion Other: |  Juventus |
| Count: | 1 |
| Second Other: | Porto |
| Matches: | 63 |
| Goals: | 199 |
| Attendance: | 1499722 |
| Top Scorer: | Viktor Hrachov Mark McGhee Serhiy Morozov 5 goals each |
| Prevseason: | 1982–83 |
| Nextseason: | 1984–85 |
The 1983–84 season of the European Cup Winners' Cup was won by Juventus in a final against Porto. The next year, the club went on to complete a full complement of European trophies with the European Cup. Aberdeen were the defending champions, but were eliminated in the semi-finals by Porto.
Universitatea Craiova, winners of the 1983 Romanian Cup Final, had their entry rejected since the Romanian Football Federation scheduled the Cup Final for one week after the closing date for entries. As a result, Andrei Rădulescu and Florin Dumitrescu, the president and secretary of the Federation, were sacked.
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Magdeburg won 2–1 on aggregate.
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3–3 on aggregate; Manchester United won on away goals.----Servette won 9–1 on aggregate.----NEC won 2–1 on aggregate.----Barcelona won 7–1 on aggregate.----Spartak Varna won 1–0 on aggregate.----Hammarby won 5–2 on aggregate.----Haka won 4–0 on aggregate.----Paris Saint-Germain won 4–2 on aggregate.----Juventus won 10–2 on aggregate.----Rangers won 18–0 on aggregate.----2–2 on aggregate; Porto won on away goals.----Shakhtar Donetsk won 9–3 on aggregate.----Újpest won 4–3 on aggregate.----Köln won 7–2 on aggregate.----Beveren won 7–3 on aggregate.----Aberdeen won 3–2 on aggregate.
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Shakhtar Donetsk won 3–1 on aggregate.----Barcelona won 5–2 on aggregate.----Manchester United won 4–1 on aggregate.----Haka won 3–2 on aggregate.----2–2 on aggregate; Juventus won on away goals. ----2–2 on aggregate; Porto won on away goals.----5–5 on aggregate; Újpest won on away goals.----Aberdeen won 4–1 on aggregate.
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Manchester United won 3–2 on aggregate.----Juventus won 2–0 on aggregate.----Porto won 4–3 on aggregate.----Aberdeen won 3–2 on aggregate.
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Juventus won 3–2 on aggregate.----Porto won 2–0 on aggregate.
See main article: 1984 European Cup Winners' Cup Final.
