The 39th New Zealand Parliament was a term of the Parliament of New Zealand which began with the general election held on 25 November 1978, and finished with the general election held on 28 November 1981. The dates of the Muldoon Ministry were from 13 December 1978 to 11 December 1981.

The 1978 New Zealand general election was a nationwide vote to elect the 39th New Zealand Parliament. It saw the governing National Party, led by Robert Muldoon, retain office, but the opposition Labour Party won the largest share of the vote. Reorganisation of the enrolment system caused major problems with the electoral rolls, which left a legacy of unreliable information about voting levels in this election.