Helen Elizabeth Clark (born 26 February 1950), a New Zealand politician and administrator, is the head of the United Nations Development Programme, the third-highest UN position. Clark was the 37th Prime Minister of New Zealand for three consecutive terms from 1999 to 2008 and led the Labour Party from 1993 until it lost the 2008 general election. Before resigning from Parliament in April 2009, Clark was Labour's foreign affairs spokeswoman and MP for the Mount Albert electorate which she had held since 1981. Forbes magazine ranked her 20th most powerful woman in the world in 2006.

Clark was the eldest of four daughters of a Waikato farming family. Her mother, Margaret McMurray, of Irish birth, was a primary school teacher. Her father, George, a farmer, supported the National Party at the 1981 election. Clark studied at Te Pahu Primary School, at Epsom Girls' Grammar School in Auckland and at the University of Auckland, where she majored in politics and graduated with an MA (Honours) in 1974. Her thesis focused on rural political behaviour and representation.

In 1971 Clark assisted Labour candidates to the Auckland City Council. Clark was a junior lecturer in political studies at the University of Auckland from 1973 to 1975. In 1974 she sought the nomination for the Auckland Central electorate, but lost to Richard Prebble. Clark studied abroad on a University Grants Committee post-graduate scholarship in 1976, and then lectured in political studies at Auckland again while undertaking her PhD (which she never completed) from 1977 until her election to Parliament in 1981.