The Third Canadian Ministry was the second cabinet chaired by Prime Minister John A. Macdonald. It governed Canada from 17 October 1878 to 6 June 1891, including the 4th, 5th, and 6th Canadian Parliaments, as well as the first three months of the 7th. The government was formed by the Liberal-Conservative Party in coalition with the old Conservative Party of Canada. Macdonald was also Prime Minister in the First Canadian Ministry.

The First Canadian Ministry was the first cabinet chaired by Prime Minister John A. Macdonald. It governed Canada from 1 July 1867 to 5 November 1873, including all of the 1st Canadian Parliament as well as the first eight months of the Second. The government was formed by the Liberal-Conservative Party in coalition with the old Conservative Party of Canada. Macdonald was also Prime Minister in the Third Canadian Ministry.