| CAD | Canadian Association of the Deaf
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| CAEP | Canadian Association of Emergency Physicians
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| CAG | Canadian Association of Gerontology
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| CAMT | Canadian Association of Music Therapy
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| CAMTS | Commission on Accreditation of Medical Transport Systems
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| CAO | Canadian Association of Orthodontists
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| CAO | Canadian Association of Optometrists
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| CAOT | Canadian Association of Occupational Therapists
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| CAP | Canadian Association of Physicists
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| CAP | College of American Pathologists
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| CAR | Canadian Association of Radiologists
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| CASLPA | Canadian Association of Speech-Language Pathologists and Audiologists
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| CASLPO | College of Audiologists and Speech-Language Pathologists of Ontario
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| CCOHS | Canadian Centre for Occupational Health and Safety
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| CCS | Canadian Cardiovascular Society
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| CDAAC | Communicative Disorders Assistant Association of Canada
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| CDC | Centers for Disease Control and Prevention
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| CMA | Canadian Medical Association
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| COTA(A) | Council on the Ageing (Australia)
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| CPhT | Certified Pharmacy Technician
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| CPME | Standing Committee of European Doctors
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| CRD | Centre for Reviews and Dissemination
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| CRNA | Certified Registered Nurse Anesthetist
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