CGY Views 7 meanings found CGY is the airport code for Calgary, Canada, and also abbreviates centiGray, a subunit of the radiation dose Gray; additionally it can refer to the Philippine city Cagayan de Oro or various regional programs. Medical CentiGray (unit of radiation) Miscellaneous Comissão Guarani Yvyrupa Cycle Greater Yellowstone Regional Cagayan de Oro, Philippines Calgary Connection Gap Year Business Carnegie International Corporation (de-listed)