- Union Harmony: or British America's Sacred Vocal Musick
- Union Nationale
- Union Station
- Union des écrivains québécois
- Union musicale de Québec
- Union musicale de Sherbrooke
- Unions
- Unitarian Service Committee of Canada
- Unitarians
- United Automobile Workers of Canada
- United Church of Canada
- United Conservative Party
- United Empire Loyalists' Association of Canada
- United Farm Women of Alberta
- United Farmers of Alberta
- United Farmers of Canada
- United Farmers of Manitoba
- United Farmers of Ontario
- United Farmers of Quebec
- United Nations
