12th Canadian Ministry

12th Canadian Ministry 12e conseil des ministres du Canada
12th ministry of Canada
Date formed	29 December 1921
Date dissolved	28 June 1926
People and organizations
Monarch	George V
Governor General	Viscount Byng
Prime Minister	William Lyon Mackenzie King
Member party	Liberal Party of Canada
Status in legislature	118 / 235 (1921–1925) Majority 100 / 245 (1925–1926) Minority
Opposition party	Conservative Party (historical)
Opposition leader	Arthur Meighen
History
Elections	1921, 1925
Legislature terms	14th Canadian Parliament 15th Canadian Parliament
Incoming formation	1921 Canadian federal election
Outgoing formation	King–Byng affair
Predecessor	11th Canadian Ministry
Successor	13th Canadian Ministry

The Twelfth Canadian Ministry was the first cabinet chaired by Prime Minister William Lyon Mackenzie King. It governed Canada from 29 December 1921 to 28 June 1926, including the 14th Canadian Parliament and most of the 15th. The government was formed by the Liberal Party of Canada. Mackenzie King was also Prime Minister in the Fourteenth and Sixteenth Canadian Ministries.