This is the main open data portal for geospatial data produced by the Government of Canada. Open Maps provides access to the Government of Canada’s geospatial information. You can combine, visualize, and analyze geospatial data and collaborate with other Canadians. You can search for a specific data and browse/search by government organization, keywords, subject, data formats.
Here are a few quick links to commonly-used sources of geospatial data (note that some may require a York login to access).