| 1991 Waterford Senior Hurling Championship | |
| Champions: | Lismore |
| Count: | 2 |
| Runners-Up: | Mount Sion |
| Previous Year: | 1990 |
| Previous Tournament: | 1990 Waterford Senior Hurling Championship |
| Next Year: | 1992 |
| Next Tournament: | 1992 Waterford Senior Hurling Championship |
The 1991 Waterford Senior Hurling Championship was the 91st staging of the Waterford Senior Hurling Championship since its establishment by the Waterford County Board in 1897.
Roanmore were the defending champions.[1]
Lismore won the championship after a 5–07 to 1–05 defeat of Mount Sion in the final.[2] This was their second championship title overall and a first title in 66 years.[3]