The United–Reform Coalition, also known as the National Political Federation from 1935, was a coalition between two of the three major parties of New Zealand, the United and Reform parties, from 1931 to 1936. The Coalition formed the United–Reform coalition Government of New Zealand from its formation in September 1931, successfully contesting and winning the 1931 general election in December. The Coalition was defeated at the 1935 general election by Labour. The following year the coalition was formalised by the formation of the modern New Zealand National Party.

The United Party was a political party in New Zealand. It was founded in 1927, partly out of the remnants of the Liberal Party, and formed the United Government between 1928 and 1931, and the United–Reform coalition Government between 1931 and 1935. In 1936, it merged with the Reform Party to form the National Party.