Medical Organizations
- International Society for Experimental Hematology (ISEH)
- International Society for Fat Research (ISF)
- International Society for Heart Research (ISHR)
- International Society for Medical Laser Applications (ISLA)
- International Society for Minimally Invasive Cardiothoracic Surgery (ISMICS)
- International Society for Preventive Oncology (ISPO)
- International Society for Prosthetics and Orthotics (ISPO)
- International Society for Sexual Medicine (ISSM)
- International Society for the Study of Hypertension in Pregnancy (ISSHP)
- International Society for the Study of Subtle Energy and Energy Medicine (ISSSEEM)
- International Society for the Study of Trauma and Dissociation (ISSTD)
- International Society of Accelerated Resolution Therapy (IS-ART)
- International Society of Aerosols in Medicine (ISAM)
- International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine (ISAKOS)
- International Society of Audiology (AUDI)
- International Society of Biometeorology (ISB)
- International Society of Biometry (ISB)
- International Society of Blood Transfusion (ISBT)
- International Society of Cardiology (ISC)
- International Society of Cell Biology (ISCB)
- International Society of Clinical Pathologists (ISCP)
- International Society of Comparative Pathology (ISCP)
- International Society of Developmental Biologists (ISDB)
- International Society of Endovascular Specialists (ISEVS)
- International Society of Exposure Science (ISES)
- International Society of Hair Restoration Surgery (ISHRS)
- International Society of Human and Animal Mycology (ISHAM)
- International Society of Hypertension (ISH)
- International Society of Internal Medicine (ISIM)
- International Society of Microbiologists (ISM)
- International Society of Neurochemistry (ISN)
- International Society of Neuroimmunology (ISN)
- International Society of Pediatric Neurosurgery (ISPN)
- International Society of Plastic and Aesthetic Nurses (ISPAN)
- International Society of Psychosomatic Obstetrics and Gynecology (ISPOG)
- International Society of Radiographers and Radiological Technicians (ISRRT)
- International Society of Radiology (ISR)
- International Society of Renal Nutrition and Metabolism (ISRNM)
- International Society of Schema Therapy (ISST)
- International Society of Travel Medicine (ISTM)
- International Society of Tropical Dermatology (ISTD)
- International Society on Hypertension in Blacks (ISHB)
- International Sociological Association (ISA)
- International Sports Sciences Association (ISSA)
- International Standard Orthopedic Measurements (ISOM)
- International Thymic Malignancy Interest Group (ITMIG)
- International Transactional Analysis Association (ITAA)
- International Tuberculosis Association (ITA)
- International Union Against Cancer (IUAC)
- International Union Against Tuberculosis (IUAT)
- International Union Against Tuberculosis Mycobacterium (IUTM)
- International Union Against Venereal Diseases and Treponematoses (IUVDT)
- International Union of Anthropological and Ethnological Sciences (IUAES)
- International Union of Associations of Doctor-Motorists (IUADM)
- International Union of Biochemistry (IUB)
- International Union of Biological Sciences (IUBS)
- International Union of Chemistry (IUC)
- International Union of Immunological Societies (IUIS)
- International Union of Nutritional Sciences (IUNS)
- International Union of Pharmacology (IUPHAR)
- International Union of Pharmacy (IUP)
- International Union of Phlebology (IUP)
- International Union of Physiological Sciences (IUPS)
- International Union of Pure and Applied Chemistry (IUPAG)
- International Union of Pure and Applied Physics (IUPAP)
- International Urogynecological Association (IUGA)
- Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC)
- Intersocietal Accreditation Commission (Vein Center) (IAC)
- Inter-Society Commission for Heart Diseases Resources (ICHD)
- Intuitive Eating Pros (IEP)
- Invalid Children's Aid Association (ICAA)
- Iowa Mental Health Counselors Association (IMHCA)
- Iowa Psychological Association (IPA)
- Irish Blood Transfusion Service (IBTS)
- Jaffna Medical Faculty Overseas Alumni (JMFOA)
- Japan Anti-Tuberculosis Association (JATA)
- Japanese Association for Dental Research (JADR)
- Japanese Foundation of Cancer Research (JFCR)
- Japanese Society of Gastroenterology (JSGE)
- Japanese Society of Radiological Technology (JSRT)
- Japan Society of Medical History (JSMH)
- Joint Commission on Accreditation of Hospitals (JCAH)
- Joint Commission on Allied Health Personnel in Ophthalmology (JCAHPO)
- Joint European Submicron Silicon Institute (JESSI)
- Journal of Dermatological Science (JDS)
- Jung Association of Central Ohio (JACO)
- Junior Hospital Medical Officer (JHMO)
- Kaiser Family Foundation (KFF)
- Kansas Medical Society (KMS)
- Kansas Society of Dermatology & Dermatologic Surgery (KSDDS)
- Kentucky Academy of Nutrition and Dietetics (KAND)
- Kentucky Board of Nursing (KBN)
- Kentucky Counseling Association (KCA)
- Kentucky Optometric Association (KOA)
- Kentucky Podiatric Medical Association (KPMA)
- Kidney Disease: Improving Global Outcomes (KDIGO)
- Kidney Disease Outcomes Quality Initiative (KDOQI)
- King's College London (KCL)
- Laboratoire National de Contrôle des Médicaments; National Laboratory of Drug Control (LNCM)
- L'Académie Européenne d'Allergologie et d'Immunologie Clinique; European Academy of Allergology and Clinical Immunology (AEAIC)