The 19th New Zealand Parliament was a term of the New Zealand Parliament. It opened on 24 June 1915, following the 1914 election. It was dissolved on 27 November 1919 in preparation for 1919 election.

The 19th Parliament opened on 24 June 1915, following the 1914 general election. It sat for six sessions (with two sessions in 1918), and was dissolved on 27 November 1919.^[1]

The 19th Parliament was the second term of the Reform Party government, which had been elected in the 1911 election. William Massey, the leader of the Reform Party, remained Prime Minister.^[2] The Liberal Party, led by former Prime Minister Joseph Ward, was technically the main opposition party, although for the majority of the term, the Liberals were part of a war-time coalition with Reform. Two small left-wing parties, the Social Democratic Party and the loosely grouped remnants of the United Labour Party, also held seats, and there was one left-wing independent (John Payne). During the 19th Parliament, the Social Democrats and most of the United Labour Party merged to form the modern Labour Party.

There were 616,043 electors on the European roll, with 521,525 (84.66%) voting, including 5,618 informal votes.^[3] Turnout including Maori voters was 540,075. The following table shows votes at and party strengths immediately after the 1914 election:^{[citation needed]}