The 1990–91 National Hurling League was the 60th season of the National Hurling League, the top league for inter-county hurling teams, since its establishment in 1925.
The season began on 14 October 1990 and concluded on 12 May 1991.
Clare and Waterford entered Division 1 as the two promoted teams.
On 12 May 1991, Offaly won the title after a 2-6 to 0-10 win over Wexford.
[1] Dublin were the first team to be relegated after losing all of their group stage games, while Clare suffered the same fate.