| Tourney Name: | UEFA Cup |
| Year: | 1974–75 |
| Dates: | 11 September 1974 – 21 May 1975 |
| Num Teams: | 64 |
| Champion Other: | Borussia Mönchengladbach |
| Count: | 1 |
| Second Other: | Twente |
| Matches: | 124 |
| Goals: | 388 |
| Attendance: | 1987332 |
| Top Scorer: | Jupp Heynckes (Borussia Mönchengladbach) 11 goals |
| Prevseason: | 1973–74 |
| Nextseason: | 1975–76 |
The 1974–75 UEFA Cup was the fourth season of the UEFA Cup, the third-tier club football competition organised by UEFA. The final was played over two legs at the Rheinstadion, Düsseldorf, West Germany, and at the Diekman Stadion, Enschede, the Netherlands. It was won by Borussia Mönchengladbach of West Germany, who defeated FC Twente of the Netherlands by an aggregate result of 5–1 to claim their first UEFA Cup title.
No team from West Germany had ever won the UEFA Cup, or its unofficial predecessor Inter-Cities Fairs Cup before Borussia's first conquest, which came two years after reaching the final in 1973. In that edition, both teams had already faced in the semi-finals, which ended with the same aggregate score. For the first time since the 1966 edition of the Inter-Cities Fairs Cup, no English team reached the final.
A total of 63 teams from 30 UEFA member associations participate in the 1974–75 UEFA Cup. The original allocation scheme was as follows:
The Netherlands and Austria were the two associations selected to have an extra third birth for this season, while Scotland and Belgium went back to two qualified teams.
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The labels in the parentheses show how each team qualified for competition:
The schedule of the competition was as follows. Matches were scheduled for Wednesdays, though some matches took place on Tuesdays and Thursdays. In the first round, both legs of the match-up between FC Amsterdam and Hibernians F.C. were played over five days in the Netherlands, with the second leg being held on a Sunday
| First round | 11–19 September 1974 | 22 September – 3 October 1974 | |
| Second round | 22–23 October 1974 | 5–13 November 1974 | |
| Third round | 27 November 1974 | 11 December 1974 | |
| Quarter-finals | 5 March 1975 | 19 March 1975 | |
| Semi-finals | 9–10 April 1975 | 22–23 April 1975 | |
| Final | 7 May 1975 | 21 May 1975 |
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Lyon won 11–1 on aggregate.----Portadown won 2–1 on aggregate.----Derby County won 6–2 on aggregate.----3–3 on aggregate, Twente won on away goals rule.----1–1 on aggregate, Ajax won on away goals rule.----RWD Molenbeek won 5–2 on aggregate.----Hibernian won 12–3 on aggregate.----Porto won 5–4 on aggregate.----Inter Milan won 3–0 on aggregate.----Partizan won 5–2 on aggregate.----Djurgården won 7–1 on aggregate.----Dinamo București won 4–0 on aggregate.----3–3 on aggregate, Velež Mostar won on away goals rule.----Steagul Roșu Brașov won 3–2 on aggregate.----Borussia Mönchengladbach won 4–2 on aggregate.----2–2 on aggregate, Royal Antwerp won on away goal rules.----1–1 on aggregate, Dynamo Dresden won on away goal rules.----Hamburg won 4–0 on aggregate.----Rapid Wien won 3–2 on aggregate.----Baník Ostrava won 5–0 on aggregate.----4–4 on aggregate, Raba ETO Győr won 5–4 in penalty shoot-out.----4–4 on aggregate, Dynamo Moscow won on away goals rule.----Nantes won 3–2 on aggregate.----Napoli won 3–1 on aggregate.----Juventus won 4–2 on aggregate.----Grasshopper won 3–2 on aggregate.----Fortuna Düsseldorf won 4–2 on aggregate.----Köln won 9–2 on aggregate.----Both legs were played in Amsterdam, the second leg was formally a 'home' game for Hibernians. Amsterdam won 12–0 on aggregate.----Atlético Madrid won 6–3 on aggregate.----Real Zaragoza won 5–1 on aggregate.
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4–4 on aggregate, Derby County won 7–6 in penalty shoot-out.----Juventus won 8–2 on aggregate.----Partizan won 6–1 on aggregate.----Baník Ostrava won 2–1 on aggregate.----Köln won 4–3 on aggregate.----Fortuna Düsseldorf won 3–2 on aggregate.----Velež Mostar won 2–1 on aggregate.----1–1 on aggregate, Dynamo Dresden won 4–3 in penalty shoot-out.----Real Zaragoza won 6–2 on aggregate.----Borussia Mönchengladbach won 6–2 on aggregate.----Hamburg won 10–1 on aggregate.----Twente won 3–1 on aggregate.----Dukla Prague won 5–1 on aggregate.----Amsterdam won 2–1 on aggregate.----Napoli won 2–0 on aggregate.----2–2 on aggregate, Ajax won on away goals rule.
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Baník Ostrava won 3–1 on aggregate.----Hamburg won 6–3 on aggregate.----Twente won 6–3 on aggregate.----Köln won 5–2 on aggregate.----Borussia Mönchengladbach won 9–2 on aggregate.----Amsterdam won 5–1 on aggregate.----2–2 on aggregate; Juventus won on away goals.----Velež Mostar won 5–4 on aggregate.
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Juventus won 2–0 on aggregate.----Köln won 8–3 on aggregate.----Twente won 2–1 on aggregate.----Borussia Mönchengladbach won 4–1 on aggregate.
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Twente won 4–1 on aggregate.----Borussia Mönchengladbach won 4–1 on aggregate.
See main article: 1975 UEFA Cup Final.
Borussia Mönchengladbach won 5–1 on aggregate.