The New Zealand constitutional crisis of 1984 arose following the 1984 general election, and was caused by a major currency crisis. The crisis led the incoming government to review New Zealand's constitutional structures, which resulted in the Constitution Act 1986.

The 1984 New Zealand general election was a nationwide vote to determine the composition of the 41st New Zealand Parliament. It marked the beginning of the Fourth Labour Government, with David Lange's Labour Party defeating the long-serving Prime Minister, Robert Muldoon, of the National Party. It was also the last election in which the Social Credit Party won seats as an independent entity. The election was also the only one in which the New Zealand Party, a protest party, played any substantial role.