| Tourney Name: | UEFA Cup |
| Year: | 1985–86 |
| Dates: | 11 September 1985 – 6 May 1986 |
| Champion Other: | Real Madrid |
| Count: | 2 |
| Second Other: | Köln |
| Matches: | 126 |
| Goals: | 374 |
| Attendance: | 3058332 |
| Top Scorer: | Klaus Allofs (Köln) 9 goals |
| Prevseason: | 1984–85 |
| Nextseason: | 1986–87 |
The 1985–86 UEFA Cup was the 15th season of the UEFA Cup, the third-tier club football competition organised by the Union of European Football Associations (UEFA). The final was played over two legs at the Santiago Bernabéu Stadium, Madrid, Spain, and at the Olympiastadion, West Berlin, West Germany. For the second year in a row, the competition was won by Real Madrid of Spain, who defeated Köln of West Germany by an aggregate result of 5–3.
Real Madrid became the first club to successfully defend the UEFA Cup, a feat that would only be repeated by Sevilla in two different occasions during the 21st century, both in the UEFA Cup (2006 and 2007) and its successor UEFA Europa League (2014 and 2015). In the former Inter-Cities Fairs Cup, the unofficial predecessor of the UEFA Cup, it was only achieved by a representative team of the city of Barcelona (1958 and 1960) and by Valencia (1963 and 1964), both also fellow Spanish squads.
It was the first season in which English clubs were serving an indefinite ban from European football competitions due to the Heysel Stadium disaster, which would last for five seasons before being lifted for the 1990-91 season.
A total of 64 teams from 31 UEFA member associations participated in the 1985–86 UEFA Cup, all entering from the first round over six knock-out rounds. The association ranking based on the UEFA country coefficients is used to determine the number of participating teams for each association:
Following the English ban, their four births were redistributed among associations 9–12, each gaining a third birth.
For the 1985–86 UEFA Cup, the associations are allocated places according to their 1984 UEFA country coefficients, which takes into account their performance in European competitions from 1979–80 to 1983–84.
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The labels in parentheses show how each team qualified for competition:
The schedule of the competition was as follows. Matches were scheduled for Wednesdays, though some matches exceptionally took place on Tuesdays or Thursdays. In a departure from previous editions, both semi-finals were played in different days, and the two-legged final was held on consecutive weeks, with the second leg being played on a Tuesday.
| First round | 11–19 September 1985 | 1–3 October 1985 | |
| Second round | 23 October 1985 | 6 November 1985 | |
| Third round | 27 November 1985 | 11 December 1985 | |
| Quarter-finals | 4–5 March 1986 | 18–19 March 1986 | |
| Semi-finals | 2–3 April 1986 | 15–16 April 1986 | |
| Final | 30 April 1986 | 6 May 1986 |
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LASK won 3–0 on aggregate.----Lokomotiv Sofia won 6–4 on aggregate.----Dinamo Tirana won 1–0 on aggregate.----2–2 on aggregate; Vardar won on away goals.----Borussia Mönchengladbach won 3–1 on aggregate.----Lokomotive Leipzig won 6–1 on aggregate.----Bohemians Praha won 5–4 on aggregate.----Dnipro won 5–2 on aggregate.----Partizan won 4-1 on aggregate.----Spartak Moscow won 4–1 on aggregate.----Legia Warsaw won 4–1 on aggregate.----Hammarby won 7-1 on aggregate.----3–3 on aggregate; Videoton won on away goals.----PSV Eindhoven won 6–0 on aggregate.----RFC Liège won 4-1 on aggregate.----Waregem won 6–2 on aggregate.----Nantes won 4–2 on aggregate.----4–4 on aggregate; Chornomorets Odesa won on away goals.----Hajduk Split won 7–3 on aggregate.----Internazionale won 5–1 on aggregate.----Sporting CP won 4-3 on aggregate.----Torino won 3–2 on aggregate.----
2–2 on aggregate; Sparta Rotterdam won 4–3 on penalties.----Club Brugge won 6–5 on aggregate.----St Mirren won 3-1 on aggregate.----Dundee United won 7–4 on aggregate.----Köln won 2–1 on aggregate.----Osasuna won 2-1 on aggregate.----Milan won 4–3 on aggregate.----Real Madrid won 5–1 on aggregate.----Athletic Bilbao won 5–1 on aggregate.----Neuchâtel Xamax won 7-4 on aggregate.
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Dundee United won 3–1 on aggregate.----Real Madrid won 2–1 on aggregate.----Legia Warsaw won 2–1 on aggregate.----Köln won 8–2 on aggregate.----Hajduk Split won 4–2 on aggregate.----Dnipro won 3–2 on aggregate.----1–1 on aggregate; Neuchâtel Xamax won on away goals.----3–3 on aggregate; Milan won on away goals.----Nantes won 5–1 on aggregate.----Borussia Mönchengladbach won 6–2 on aggregate.----Spartak Moscow won 4–1 on aggregate.----Athletic Bilbao won 4–1 on aggregate.----Hammarby won 5–4 on aggregate.----Internazionale won 4–1 on aggregate.----Waregem won 3–2 on aggregate.----Sporting CP won 1–0 on aggregate.
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Hajduk Split won 3–0 on aggregate.----Internazionale won 1–0 on aggregate.----Köln won 4–3 on aggregate.----Nantes won 2–1 on aggregate.----Neuchâtel Xamax won 4–3 on aggregate.----Following the referee's controversial decision to award Waregem a penalty in the 44th minute as the foul looked to be outside of the penalty area, Milan fans pelted the pitch with missiles some of which hit several Waregem players. Following the match, as a result of the incident, AC Milan received a two-match European competition stadium ban, enforced at the start of their 1987–88 UEFA Cup campaign.
Waregem won 3–2 on aggregate.----5–5 on aggregate; Real Madrid won on away goals.----Sporting CP won 4–2 on aggregate.
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Köln won 3–1 on aggregate.----
1–1 on aggregate; Waregem won 5–4 on penalties.----Internazionale won 6–3 on aggregate.----Real Madrid won 3–2 on aggregate.
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Köln won 7–3 on aggregate.----Real Madrid won 6–4 on aggregate.
See main article: 1986 UEFA Cup final.
Real Madrid won 5–3 on aggregate.