Can I apply for renewal on the grounds of marriage after my Canadian tourist visa has expired?

No. The Canadian Immigration Bureau does not allow tourist visa holders to directly apply for visa extension for personal reasons such as marriage, because this is not a reason for visa extension recognized by the Canadian Immigration Bureau. The Canadian tourist visa provides entry permission for short-term tourism, family visits, business and visits to those who hold this visa. A tourist visa is a non-immigrant visa with a limited validity period. Once it expires, the holder must leave the country and cannot stay in the country.