Sir Hugh John Macdonald (March 13, 1850-March 29, 1929) was the only surviving son of Sir John A. Macdonald and a politician in his own right serving briefly as premier of Manitoba.

Born in Kingston, Ontario, Macdonald received a Bachelor of Arts degree from the University of Toronto in 1869 and studied law in Toronto and Ottawa. He left for Manitoba in 1870 as part of the Wolseley Expedition, which was formed to put down Louis Riel's Red River Rebellion. After taking part in the bloodless capture of Upper Fort Garry (after Riel's departure), he returned to Ontario and his legal studies. He was called to the Bar in 1872, and became a member of his father's firm.

Grieved by the death of his first wife, Macdonald moved to Winnipeg in 1882. He set up his own law practice, and took part in putting down Riel's second rebellion three years later.

Macdonald was elected to the Canadian House of Commons in 1891, representing Winnipeg City for the Conservative Party. He was sworn into parliament at the side of his father, to the applause of members from both sides. After the older Macdonald died later in the year, however, Hugh John showed little enthusiasm for life in Ottawa. Despite efforts by John Abbott and John S.D. Thompson to keep him in federal politics, he resigned his seat in 1893 and returned to Winnipeg.

In 1896, Prime Minister Charles Tupper convinced him to return to Ottawa and serve as Minister of the Interior and Superintendent-General of Indian Affairs . This was at a time when the Conservative Party was suffering from internal divisions, and was due to face the public in a general election. Tupper probably hoped that the Macdonald name would win back some wayward voters.

The election was won by Wilfrid Laurier's Liberals, and while Macdonald was again elected for Winnipeg City (narrowly defeating former provincial minister Joseph Martin), his election was declared void in early 1897. He once again returned to Winnipeg, and did not contest the subsequent by-election.

In March 1897, Macdonald was approached to take the leadership of Manitoba's Conservative Party. The party had suffered severe losses in the elections of 1888, 1892 and 1896, and had lacked direction since the death of former Premier John Norquay in 1889. By 1897, however, there was a recognition that the political situation of the province could soon change. Greenway's second and third majorities were based almost entirely on popular support for his education reforms; with the education issue resolved in 1896, the Conservatives suddenly had a viable chance to form government. Macdonald accepted the leadership position, and (though without seat in the legislature) spent the next two years touring the province in anticipation of the next election.

The Conservative Party of Manitoba became a legally recognized entity in 1899, and drew up its first election platform shortly thereafter. This was a progressive document by the standards of its age, calling for an independent board of education, new agricultural and technical colleges, a Workmen's Compensation Act, prohibition, and the nationalization of railways. On a less progressive note, the party was also able to tap into popular resentment toward new Eastern European immigrants. Both of these factors contributed to an upset victory on December 7 1899, with Conservatives taking 22 seats out of 40. Macdonald narrowly defeated incumbent Liberal John D. Cameron in Winnipeg South, and was sworn in as Premier on January 10, 1900.

His term in office was brief. Macdonald succeeded in passing a prohibition bill (known as the "Macdonald Act"), but was again prevailed upon to run for the federal Conservatives in 1900. It is possible that he intended to replace Charles Tupper as national party leader.

Macdonald resigned as Premier on October 29 1900, and challenged Minister of the Interior Clifford Sifton in the riding of Brandon. Sifton was the most powerful cabinet minister in western Canada, but the Conservatives believed that Hugh John's personal popularity would be enough to defeat him. They were mistaken. Despite a spirited challenge, Sifton won the election by 5011 votes to 4342.

Macdonald abandoned electoral politics after this, and returned to his law practice. He continued to be involved in the Conservative Party organization within Manitoba, serving as President of the Manitoba Conservative Association from 1905 to 1908. He was appointed Police Magistrate for Winnipeg in 1911, and was made a Knight Bachelor in 1915.

Hugh John Macdonald was Winnipeg's Magistrate during the Winnipeg General Strike in 1919. Foreign-born immigrants arrested during the strike appeared before him and he ordered them sent to an internment camp at Kapuskasing from where they were eventually deported without the right to formal hearings.