On April 3, five by-elections will be held for the Canadian House of Commons. On February 22, Prime Minister Justin Trudeau announced four by-elections for the electoral districts of Saint-Laurent, Quebec, Calgary Heritage and Calgary Midnapore, Alberta, and Markham—Thornhill, Ontario. Trudeau had previously announced on February 19 a by-election would be held for the electoral district of Ottawa—Vanier, Ontario.

The vacancies requiring the by-elections came about for different reasons. Last year, former prime minister Stephen Harper and member of Parliament(MP) Jason Kenney resigned from their House of Commons seat representing electoral districts Calgary Heritage and Calgary Midnapore, respectively.

The seats for electoral districts Saint-Laurent and Markham-Thornhill were left vacant last month after ministers Stephane Dion and John McCallum were named to diplomatic posts, according to the Globe and Mail. The seat representing electoral district Ottawa-Vanier became vacant when MP Mauril Belanger died last year from amyotrophic lateral sclerosis.