The Young Communist League of Canada (YCL-LJC) is a Canadian Marxist–Leninist youth organization founded in 1922. The organization is ideologically aligned with, but organizationally independent from, the Communist Party of Canada. The organization's members played a leading role in the On-to-Ottawa Trek and made up a significant portion of the Mackenzie–Papineau Battalion, which fought on the Republican side in the Spanish Civil War.

The Communist Party of Canada is a federal political party in Canada. Founded in 1921 under conditions of illegality, it is the second oldest active political party in Canada, after the Liberal Party of Canada. Although it does not currently have any parliamentary representation, the party's candidates have previously been elected to the House of Commons, the Ontario legislature, the Manitoba legislature, and various municipal governments across the country.