The 19th Parliament opened on 24 June 1915, following the 1914 general 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.

The following table shows votes at and party strengths immediately after the 1914 election:[citation needed] 76 general and 4 Māori electorates existed for the 19th Parliament.

The following are the results of the 1914 general election: Key Liberal Reform United Labour Social Democrat Independent Labour Independent There were a number of changes during the term of the 19th Parliament.