Medical Organizations
- Canadian Optimal Medication Prescribing and Utilization Service (COMPUS)
- Canadian Pharmacists Association (CPA)
- Canadian Physiotherapy Association (CPA)
- Canadian Psychological Association (CPA)
- Canadian Red Cross (CRC)
- Canadian Rheumatology Association (CRA)
- Canadian Society for Exercise Physiology (CSEP)
- Canadian Society of Allergy and Clinical Immunology (CSACI)
- Canadian Tuberculosis Association (CTA)
- Cancer National Specialist Advisory Group (CNSAG)
- Cardiothoracic Surgery Network (CTSNet)
- Cardiovascular and Interventional Radiological Society of Europe (CIRSE)
- Catholic Health Association of the United States (CHAUSA)
- Catholic Medical Association (CMA)
- Catholic Psychotherapy Association (CPA)
- CDS Consortium (CDSC)
- Center for Allied Health Education (CAHE)
- Center for Applications of Psychological Type (CAPT)
- Center for Clinical and Translational Science (CCTS)
- Center for Early Intervention on Deafness (CEID)
- Center for Excellence in Primary Care (CEPC)
- Center for First-Year Advising (CFYA)
- Center for Neurorestoration and Neurotechnology (CfNN)
- Center for Outcomes Research & Evaluation (CORE)
- Center for Rehabilitation Outcomes Research (CROR)
- Center for Science in the Public Interest (CSPI)
- Center for Substance Abuse Prevention (CSAP)
- Center for Toxicology & Environmental Health (CTEH)
- Center of Science, Policy, and Society Programs (CSPSP)
- Centers for Disease Control and Prevention (CDC)
- Centers for Medicare and Medicaid Services (CMS)
- Central and Eastern European, Committee for Thermal Analysis and Calorimetry (CEEC-TAC)
- Central Arizona Dental Society Foundation (CADSF)
- Central Association of Obstetricians and Gynecologists (CAOG)
- Central Council for District Nursing (CCDN)
- Central Council for Health Education (UK) (CCHE)
- Central Dental Laboratories (CDL)
- Central Florida District Dental Association (CFDDA)
- Central Neuropsychiatric Association (CNA)
- Centre de Recherches et Documentation sur la Consommation; Center for Research and Documentation of Consumption (CREDOC)
- Centre d'Etude des Maladies des Artères Coronaires; Study Center for Coronary Artery Disease (France) (CEMAC)
- Centre Européen d'Histoire de la Médecine; European Center for the History of Medicine (GEHM)
- Centre for Evidence-Based Medicine (CEBM)
- Centre for Healthcare Innovation (CHID)
- Centre for Research in Neurodegenerative Diseases (CRND)
- Centre for Treatment of Anxiety & Depression (CTAD)
- Centre for Workforce Intelligence (CfWI)
- Centre Interaméricaine de Biostatistique; Interamerican Center of Biostatistics (CIB)
- Centre National pour la Recherche Scientifique; National Center for Scientific Research (CNRS)
- Centro Internazionale Radio Medico; International Radio Medical Center (CIRM)
- Charlotte Transgender Healthcare Group (CTHCG)
- Chartered Society of Massage and Medical Gymnastics (UK) (CSMMG)
- Chartered Society of Physiotherapy (CSP)
- Chest and Heart Association of Trinidad & Tobago (CHATT)
- Chest, Heart, & Stroke Scotland (CHSS)
- Chicago Dental Society (CDS)
- Chicago Hearing Society (CHS)
- Chicago Ophthalmological Society (COS)
- Chicago Surgical Society (CSS)
- Childbirth and Postpartum Professional Association (CAPPA)
- Child Neurology Society (CNS)
- Children and Adults with Attention-Deficit/Hyperactivity Disorder (CHADD)
- Children's Hospital Association (CHA)
- Chi Sigma Iota (CSI)
- Christian Association for Psychological Studies (CAPS)
- Christian Counselors of Texas (CCT)
- Christian Medical & Dental Associations (CMDA)
- Christian Youth Fellowship (CYF)
- Cleveland Vascular Society (CVS)
- Clinical Orthopaedic Society (COS)
- Clinical Social Work Association (CSWA)
- Coalition for Rescheduling Cannabis (CRS)
- COAMED Foundation Inc. (COAMED)
- Colegio de Nutricionistas y Dietistas de Puerto Rico (CNDPR)
- Collaborative International Pesticides Analytical Council (CIPAC)
- College of American Pathologists (CAP)
- College of Family Physicians of Canada (CFPC)
- College of General Studies, Boston University (CGS)
- College of Optometrists in Vision Development (COVD)
- College of Pastoral Supervision and Psychotherapy (CPSP)
- College of Physicians of Philadelphia (CPP)
- College of Sports Science and Technology (CSST)
- Collegiate and Professional Sports Dietitians Association (CPSDA)
- Collegium Internationale Neuro-Psychopharmacologicum; International College of Neuropsycho-pharmacology (CINP)
- Collier County Medical Society (CCMS)
- Collin-Fannin County Medical Society (CFCMS)
- Colorado Academy of Veterinary Technology (CAVT)
- Colorado Association of Addiction Counselors (CAAP)
- Colorado Breastfeeding Coalition (COBFC)
- Colorado Clinical & Translational Sciences Institute (CCTSI)
- Colorado Counseling Association (CCA)
- Colorado Lactation Consultant Association (CLCA)
- Colorado Medical Society (CMS)
- Colorado Physical Therapy Network (CPTN)
- Colorado School Counselor Association (CSCA)
- Comité International de Poids et Mesures; International Committee of Weights and Measures (CIPM)
- Commission Consultative Médicale; Commission for Consultant Medicine (CCM)
- Commission de Pharmacie Practique; Commission for Applied Pharmacy (Switzerland) (CPP)
- Commission Internationale de Phytopharmacie; International Commission of Phytopharmacy (GIP)
- Commission on Accreditation and Rehabilitation Facilities (GARF)