David Lange, New Zealand lawyer and politician, 32nd Prime Minister of New Zealand (b. 1942)
David Russell Lange ( LONG-ee; 4 August 1942 – 13 August 2005) was a New Zealand politician who served as the 32nd prime minister of New Zealand from 1984 to 1989.

A lawyer by profession, Lange was first elected to the New Zealand Parliament in the Mangere by-election of 1977. He soon gained a reputation for cutting wit (sometimes directed against himself) and eloquence. Lange became the Leader of the Labour Party and Leader of the Opposition in 1983, succeeding Bill Rowling.

When Prime Minister Robert Muldoon called an election for July 1984 Lange led his party to a landslide victory, becoming, at the age of 41, New Zealand's youngest prime minister of the 20th century. Lange took various measures to deal with the economic problems he had inherited from the previous government. Some of the measures he took were controversial; the free-market ethos of the Fourth Labour Government did not always conform to traditional expectations of a social-democratic party. He also fulfilled a campaign promise to deny New Zealand's port facilities to nuclear-armed and nuclear-powered vessels, making New Zealand a nuclear-free zone. Lange and his party were re-elected in August 1987; he resigned two years later and was succeeded by his deputy, Geoffrey Palmer. He retired from Parliament in 1996. Prime Minister Helen Clark described New Zealand's nuclear-free legislation as his legacy.