Nicholas Frank Hugo Greiner is an Australian politician who served as the 37th Premier of New South Wales from 1988 to 1992. Greiner was Leader of the New South Wales Division of the Liberal Party from 1983 to 1992 and Leader of the Opposition from 1983 to 1988. Greiner had served as the Federal President of the Liberal Party of Australia from 2017 to 2020. He is the current Consul-General in the United States of America, New York.

The Leader of the Opposition is a title held by the leader of the second-largest party in the New South Wales Legislative Assembly, the lower house of the Parliament of New South Wales. There is also a Leader of the Opposition in the Legislative Council. The leader acts as the public face of the opposition, leading the opposition on the floor of parliament. They act as a chief critic of the government and ultimately attempt to portray the opposition as a feasible alternate government. They are also given certain additional rights under parliamentary standing orders, such as extended time limits for speeches.