John Bracken PC (22 June 1883 – 18 March 1969) was a Canadian agronomist and politician who was the 11th and longest-serving premier of Manitoba (1922–1943) and later the leader of the Progressive Conservative Party of Canada (1942–1948).

Bracken was born in Ontario, and was a professor of animal husbandry at the University of Saskatchewan before moving to Manitoba in 1920. A political outsider, he was named leader of the Progressive Party of Manitoba following its upset victory in the 1922 Manitoba general election. During his tenure as premier of Manitoba, he implemented policies dominated by rural interests and opposed organized labour. He oversaw the creation of a universal pension, the provincial income tax, and reductions in spending on health, education and welfare as well as the replacement of the first past the post voting system with alternative voting. He pursued development by promoting staple industries such as mining, timber and fishing. After leading the Progressive Party to a second consecutive majority in the 1927 election, he merged the Progressive Party with the Liberal Party of Manitoba to form the Liberal-Progressive Party in 1932. He led the Liberal-Progressive Party to consecutive victories in elections in 1932, 1936 and 1941, winning majority governments in all but the 1936 election.

In 1942, he agreed to run for the leadership of the federal Conservative Party of Canada at the condition that the party be renamed the Progressive Conservative Party of Canada. After being elected leader of the newly renamed party, he resigned as premier of Manitoba and led the PCs to a second-place finish during the 1945 Canadian federal election against the incumbent Liberal Party government led by Prime Minister William Lyon Mackenzie King. He resigned as leader of the party in 1948 and was succeeded by George A. Drew. After being defeated while running for reelection to the House of Commons in the 1949 federal election, he retired from politics and died in 1969.

Bracken was born in Ellisville, Ontario, the son of Ephriam Michael Bracken and Alberta Gilbert. He was raised on a large dairy farm and began managing it as a teenager. He and was educated at Brockville Collegiate Institute and the Ontario Agricultural College. He did a year of postgraduate work at the University of Illinois.

Not long after graduating from the Ontario Agricultural College, Bracken moved to Manitoba, where he worked for the Dominion Seed Branch. When Saskatchewan became a province in 1905, Bracken became its first inspector of institutes and fairs. He also spent two years as the province's livestock commissioner. In 1909, he married Alice Wylie Bruce.

Bracken was chosen to be one of the first professors of the University of Saskatchewan's agricultural college, which opened in 1910. He was head coach of the school's football team in 1915 and 1917. In 1920, he moved to Winnipeg when he became president of the Manitoba Agricultural College.

In 1922, the United Farmers of Manitoba unexpectedly won the provincial election. The UFM's expectations had been so low going into the election that they had not even named a leader and ran candidates in only two thirds of the seats.

With their upset victory, the UFM faced the task of naming a leader who would become the province's new premier. After federal MPs Thomas Crerar and Robert Hoey turned down the UFM's offer, they turned to Bracken, who accepted. His selection was a surprise, as he had never sought public office and had not been identified with the party prior to becoming its leader. He was sworn in as premier on August 8 and entered the legislature a few months later after winning a deferred election in the northern riding of The Pas.