The Labour Party defeated the governing National Party in the New Zealand general election, with Labour's Helen Clark becoming the country's first female prime minister to have won office at an election.

The New Zealand Labour Party, also known simply as Labour, is a centre-left political party in New Zealand. The party's platform programme describes its founding principle as democratic socialism, while observers describe Labour as social democratic and pragmatic in practice. The party participates in the international Progressive Alliance. It is one of two major political parties in New Zealand, alongside its traditional rival, the National Party.

The New Zealand National Party, often shortened to National or the Nats, is a centre-right political party in New Zealand that is the current senior ruling party. It is one of two major parties that dominate contemporary New Zealand politics, alongside its traditional rival, the Labour Party.

The 1999 New Zealand general election was held on 27 November 1999 to determine the composition of the 46th New Zealand Parliament. The governing National Party, led by Prime Minister Jenny Shipley, was defeated, being replaced by a coalition of Helen Clark's Labour Party and the smaller Alliance. This marked an end to nine years of the Fourth National Government, and the beginning of the Fifth Labour Government which would govern for nine years in turn, until its loss to the National Party in the 2008 general election. It was the first New Zealand election where both major parties had female leaders.

Helen Elizabeth Clark is a New Zealand politician who served as the 37th prime minister of New Zealand from 1999 to 2008 and was the administrator of the United Nations Development Programme from 2009 to 2017. She was New Zealand's fifth-longest-serving prime minister, and the second woman to hold that office.