18th Canadian Ministry

18th Canadian Ministry 18e conseil des ministres du Canada
18th ministry of Canada
Date formed	21 June 1957
Date dissolved	22 April 1963
People and organizations
Monarch	Elizabeth II
Governor General	Vincent Massey Georges Vanier
Prime Minister	John Diefenbaker
Member party	Progressive Conservative Party of Canada
Opposition party	Liberal Party of Canada
Opposition leader	Louis St. Laurent (1957–1958) Lester B. Pearson (1958–1963)
History
Elections	1957, 1958, 1962
Legislature terms	23rd Canadian Parliament 24th Canadian Parliament 25th Canadian Parliament
Predecessor	17th Canadian Ministry
Successor	19th Canadian Ministry

The Eighteenth Canadian Ministry was the cabinet chaired by Prime Minister John Diefenbaker. It governed Canada from 21 June 1957 to 22 April 1963, including all of the 23rd, 24th, and 25th Canadian Parliaments. The government was formed by the Progressive Conservative Party of Canada.