How to Organize or Start a Union

• Canadian Union of Postal Workers (CUPW): representing workers in postal, delivery, logistics, transportation, communication, and more

• Canadian Union of Public Employees (CUPE): representing workers in education, health care, social services, municipal government, airlines, communications, and more

• Laborers International Union of North America (LiUNA): representing workers in construction, waste management, show services and healthcare

• National Union of Public and General Employees (NUPGE): a federation of unions representing workers in government, health care, and more

• Public Service Alliance of Canada (PSAC): representing workers in federal government departments and agencies, Crown Corporations, universities, casinos, community services agencies, Aboriginal communities, airports, the security sector, and more

• Service Employees International Union (SEIU): representing workers in healthcare, the public sector and property services 

• Teamsters Canada: representing workers in transportation, delivery, warehousing, construction, retail, food production, entertainment, social services, security and more

• United Food and Commercial Workers (UFCW): representing workers in every part of the food chain, as well as healthcare, security, non-food manufacturing, retail, office and professional workers, and more

• UNIFOR: representing workers in manufacturing, services, natural resources, transportation and communications

• United Steelworkers: representing workers in manufacturing, health care, education, utilities, communication and more

Many other unions represent workers in a single occupation (i.e. teachers, nurses) and/or a single province: list of all trade unions in Canada (Wikipedia).