The Canadian Internet Registration Authority (CIRA) (French: Autorité canadienne pour les enregistrements Internet ACEI) is a non-profit Canada corporation that is responsible for operating the .ca country code top-level domain. It was incorporated in 1998 and assumed operation of .ca on December 1st, 2000 from the University of British Columbia. CIRA is based in the national capital Ottawa, Ontario.

Canadian federal departments and agencies do not, as a rule, register directly under the .ca domain name but register their domain names in the gc.ca sub-domain with the Department of Public Works and Government Services of Canada registry that is accessible at [http://registry.gc.ca/ registry.gc.ca].

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