| Copa del Rey | |
| Year: | 1991–92 |
| Other Titles: | 90th Copa del Rey |
| Country: |  Spain |
| Num Teams: | 84 |
| Winners: | Club Atlético de Madrid |
| Second: | Real Madrid CF |
| Matches: | 165 |
| Goals: | 443 |
| Scoring Leader: | Anton Polster Antonio José Rivera Eduardo Rodríguez (8 goals each) |
| Prev Season: | 1990–91 |
| Next Season: | 1992–93 |
The 1991–92 Copa del Rey was the 90th staging of the Spanish Cup.
The competition started on 21 August 1991 and concluded on 27 June 1992 with the Final, held at the Santiago Bernabéu Stadium in Madrid, in which Atlético Madrid lifted the trophy with a 2–0 victory over Real Madrid.
See main article: 1992 Copa del Rey Final.