1991 European Cup (water polo)
# 1991 European Cup (water polo)

The 1991 European Water Polo Champions' Cup was the 28th edition of the premier competition for European men's water polo teams. Defending champion Mladost Zagreb defeated Canottieri Napoli in the final to win its sixth title, tying with as the competition's most successful team.

## Quarterfinals

| Team #1 | Agg. | Team #2 | 1st | 2nd |
| - | - | - | - | - |
| Mladost Zagreb | 17–16 | Polar Bears Ede | 8–6 | 9–10 |
| Glyfada | 10–21 | CSKA Moscow | 7–7 | 3–14 |
| Spandau 04 | 23–19 | Lokomotiv Sofia | 13–9 | 10–10 |
| Cercle Marseille | 17–20 | Canottieri Napoli | 12–8 | 5–12 |

## Semifinals

| Team #1 | Agg. | Team #2 | 1st | 2nd |
| - | - | - | - | - |
| Mladost Zagreb | 19–15 | CSKA Moscow | 10–9 | 9–6 |
| Spandau 04 | 15–19 | Canottieri Napoli | 8–9 | 7–10 |

## Final

| Team #1 | Agg. | Team #2 | 1st | 2nd |
| - | - | - | - | - |
| Mladost Zagreb | 21–17 | Canottieri Napoli | 10–7 | 11–10 |
