1990–91 Pilkington Cup
| 1990–91 Pilkington Cup | |
|---|---|
| Countries | England |
| Champions | Harlequins (2nd title) |
| Runners-up | Northampton |
| Matches played | 74 |
The 1990–91 Pilkington Cup was the 20th edition of England's, premier (at that time) rugby union club competition. Harlequins won the competition, for the second time, defeating Northampton 25 – 13 at Twickenham. The event was sponsored by Pilkington.