Elections to the 50th Parliament of New South Wales were held on Saturday 25 May 1991. All seats in the Legislative Assembly and half the seats in the Legislative Council were up for election. The Liberal–National Coalition government of Premier Nick Greiner, which enjoyed a considerable majority following their landslide win at the 1988 election, was seeking a second term in office against new Labor Opposition Leader Bob Carr.

The New South Wales Liberal Party, officially called the Liberal Party of Australia, New South Wales Division, and colloquially known as the NSW Liberal Party, is the state division of the Liberal Party of Australia in New South Wales. The party is currently in Opposition in New South Wales in a coalition with the National Party. The party is part of the federal Liberal Party which is in opposition on the mainland of Australia, with Tasmania being the exception.