Contact the vital statistics office in the province or territory where you were born to ask for a birth certificate. Certain provinces have different documents that is also accept as proof of Canadian citizenship:
- Ontario: certified copy of birth registration
- Quebec: birth certificate or copy of an act of birth issued after January 1, 1994, from the Directeur de l’état civil
- British Columbia: Certified True Copy of a Registration Document – Registration of Live Birth, Given in cases where the name of the bearer is more than 30 characters for the surname(s) or 30 characters for the given name(s).
- New Brunswick: certified extract of a registration document, Given in cases where the name of the bearer is more than 39 characters for the surname(s) and 30 characters for the given name(s).
- Northwest Territories: Registration of Birth, Certificate of Registration of Birth, or Registration of Live Birth, Given in cases where the surname(s) and given name(s) of the bearer are more than a total of 58 characters.
- Nova Scotia: certified photocopy of a Live Birth Registration, Given in cases where the name of the bearer is more than 30 characters for the surname(s) and 38 characters for the given name(s).
Ref: https://www.canada.ca/en/immigration-refugees-citizenship