The high commissioner of the United Kingdom to Canada is the United Kingdom's foremost diplomatic representative in Canada and is in charge of the British diplomatic mission to Canada. As fellow members of the Commonwealth of Nations, diplomatic relations between the United Kingdom and Canada are at governmental level, rather than between heads of state, sharing the same King. Thus, the countries exchange High Commissioners, rather than ambassadors. The offices of the British High Commission are at 80 Elgin Street in Ottawa, which was built in 1964 on the site of the old Grand Union Hotel. The British High Commissioner's residence is Earnscliffe in Ottawa on Sussex Drive. The house was built in 1855, was later occupied by Canada's first prime minister, John A. Macdonald, and was bought in 1930 by the first British High Commissioner to Canada, Sir William Clark. The incumbent high commissioner is Susannah Goshko, who assumed the office in September 2021.

List of heads of mission

High commissioners to Canada