The 1990 Waterford Senior Hurling Championship was the 90th staging of the Waterford Senior Hurling Championship since its establishment by the Waterford County Board in 1897.
Roanmore entered the championship as the defending champions.
The final was played on 7 October 1990 at Fraher Field in Dungarvan, between Roanmore and Ballyduff Upper, in what was their second consecutive meeting in the final. Roanmore won the match by 3âÂÂ13 to 2âÂÂ06 to claim their second championship title overall and a second championship title in succession.