See also: 1920 in Canada, other events of 1921, 1922 in Canada and the Timeline of Canadian history.

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Events

• March 26 - The Bluenose is launched
• June 9 - 1921 Saskatchewan election: William M. Martin's Liberals win a fifth consecutive majority
• July 18 - 1921 Alberta election: Herbert Greenfield's United Farmers of Alberta win a majority, defeating Premier Charles Stewart's Liberals
• July 27 - Frederick Banting and Charles Best discover insulin
• August 13 - Herbert Greenfield becomes premier of Alberta, replacing Charles Stewart
• November 21 - Canada is granted a coat of arms by Royal Proclamation. Canada's official colours declared to be red and white
• December 6 - Federal election: Mackenzie King's Liberals win a minority, defeating Arthur Meighen's Conservatives. Agnes Macphail becomes the first woman elected to parliament
• December 29 - Mackenzie King becomes prime minister, replacing Arthur Meighen
• The School Board in Victoria, B.C. creates a segregated school for the Chinese population. After a boycott of the new school the plan is scrapped.
• A study of Saskatchewan school student's discovers that over 56% of them are infected with tuberculosis

Births

• January 6 - Hazen Argue, politician
• January 20 - Jacques Ferron, founder of the Parti Rhinocéros
• February 8 - Barney Danson, politician
• February 17 - George Manuel, Native leader
• February 25 - Pierre Laporte, Quebec politician
• March 10 - Cec Linder, actor
• March 27 - Calvin Gotlieb, computer scientist
• April 30 - Donald Campbell Jamieson, politician
• May 12 - Farley Mowat, novelist
• May 31 - Peter Fox, Manitoba politician
• June 8 - Alexis Smith, actor
• July 6 - Allan MacEachen, politician
• August 4 - Maurice Richard, ice hockey player
• August 8 - John Herbert Chapman, scientist
• August 25 - Monty Hall, game show host
• September 16 - Ursula Franklin, scientist and activist
• September 29 - James Cross, kidnapping victim
• November 25 - Fraser Elliott, lawyer
• December 4 - Deanna Durbin, singer and actor
• December 6 - George Beurling, fighter ace
• December 10 - Howard Fredeen, scientist

Deaths

• January 21 - Arthur L. Sifton, premier of Alberta (1910-17)