| Copa del Rey | |
| Year: | 1985–86 |
| Other Titles: | 84th Copa del Rey |
| Country: |  Spain |
| Dates: | 11 September 1985 – |
| Num Teams: | 142 |
| Winners: | Real Zaragoza |
| Second: | Barcelona |
| Matches: | 281 |
| Goals: | 816 |
| Prev Season: | 1984–85 |
| Next Season: | 1986–87 |
The 1985–86 Copa del Rey was the 84th staging of the Copa del Rey, the annual domestic cup competition in the Spanish football. The tournament was attended by 142 teams from the main categories of Spaniard football.
The tournament began on 11 September 1985 and ended on 26 April 1986 with the final, held in Vicente Calderón Stadium in Madrid.
Real Zaragoza won their third title and got reedit the title after 20 years. The final ended with a 1–0 victory over Barcelona with a solitary goal from Rubén Sosa.
The defending champions, Atlético Madrid, were defeated 2–1 (on the aggregate score) by Barcelona in the quarter-finals.
| Round | Fixture | Clubs | Gain entry |
|---|---|---|---|
| First round | 64 | 142 → 78 | All clubs participating gain entry |
| Second round | 32 | 78 → 46 | Sporting Gijón (*) |
| Third round | 21 | 46 → 25 | Osasuna (*) |
| Fourth round | 9 | 25 → 16 | |
| Round of 16 | 8 | 16 → 8 | (*) |
| Quarter-finals | 4 | 8 → 4 | |
| Semi-finals | 2 | 4 → 2 | |
| Final | 1 | 2 → 1 |
| 1ª División | 18 | |
| 2ª División | 20 | |
| 2ª División B | 26 | |
| 3ª División | 78 | |
| Total teams | 142 |
|}
|}
|}
See main article: 1986 Copa del Rey Final.