The Menzies government (1949–1966) refers to the second period of federal executive government of Australia led by Prime Minister Robert Menzies. It was made up of members of a Liberal–Country Party coalition in the Australian Parliament from 1949 to 1966. Menzies led the Liberal–Country Coalition to election victories in 1949, 1951, 1954, 1955, 1958, 1961 and 1963. Robert Menzies was Australia's longest serving prime minister. He had served a previous term as prime minister as leader of the United Australia Party from 1939–1941. Although he would retire in 1966, his party would remain in office until 1972, an unprecedented 23 years of government from nine consecutive election victories.
The United Australia Party had been formed as a new conservative alliance in 1931, with Labor defector Joseph Lyons as its leader and John Latham, hitherto leader of the Nationalist Party of Australia as his deputy. The stance of Lyons and another former Labor minister, James Fenton, against the more radical proposals of the Labor movement to deal the Great Depression had attracted the support of prominent Australian conservatives. In March 1931, though still a member of the ALP, Lyons supported a no confidence motion against the Scullin Labor government and the UAP was formed from a coalition of citizens' groups and with the support of the Nationalist Party. In November 1931, Lang Labor dissidents chose to challenge the Scullin Labor government and align with the UAP to pass a 'no confidence' and the government fell.
With Australia still suffering the effects of the Great Depression, the newly formed United Australia Party won a landslide victory at 19 December 1931 Election, and the UAP commenced its first term in government in January 1932. The Lyons government won three consecutive elections, pursuing a conservative fiscal policy of balanced budgets and debt reduction, while stewarding Australia out of the Depression.
Lyons death in April 1939 saw Robert Menzies assume the prime ministership on the eve of World War II.