The Liberal Government of New Zealand was the first responsible government in New Zealand politics organised along party lines. The government formed following the founding of the Liberal Party and took office on 24 January 1891, and governed New Zealand for over 21 years until 10 July 1912. To date, it is the longest-serving government in New Zealand's history. The government was also historically notable for enacting significant social and economic changes, such as the Old Age Pensions Act and women's suffrage. One historian described the policies of the government as "a revolution in the relationship between the government and the people".

New Zealand is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island and the South Island —and over 700 smaller islands. It is the sixth-largest island country by area and lies east of Australia across the Tasman Sea and south of the islands of New Caledonia, Fiji, and Tonga. The country's varied topography and sharp mountain peaks, including the Southern Alps, owe much to tectonic uplift and volcanic eruptions. New Zealand's capital city is Wellington, and its most populous city is Auckland.