Medical Organizations
- La Fédération internationale de la sclérose en plaques; International Federation for the Study of Atheromatous Plaques (FISP)
- La Leche League (LLL)
- Lamaze International (LAMAZE)
- Laser Association of Neurological Surgeons International (LANSI)
- La Société Canadienne de Génie Agroalimentaire et de Bioingénierie; Canadian Society for Bioengineering (CSBE)
- Lawson Wilkins Pediatric Endocrine Society (LWPES)
- League of Red Cross Societies (LRCS)
- LGBTQ+ Affirmative Therapists Guild of Utah (LGBTQ+ATGU)
- Liaison Committee on Medical Education (LCME)
- Licensed Professional Counsellors Association of Georgia (LPCAGA)
- Licensed Professional Counselors Association of Georgia (LPCA)
- Ligue des Sociétés de la Croix-Rouge; League of Red Cross Societies (LSCR)
- Los Angeles County Medical Association (LACMA)
- Los Angeles County Psychological Association (LACPA)
- Louisiana Association for Play Therapy (LAPT)
- Louisiana Association of Nurse Practitioners (LANP)
- Louisiana Counseling Association (LCA)
- Lourdes Institute of Wholistic Studies (LIWS)
- Lymphatic Education & Research Network (LERN)
- Lymphology Association of North America (LANA)
- Maine Osteopathic Association (MOA)
- Maine Phlebology Association (MPA)
- Manatee County Medical Society (MCMS)
- Manufacturing Chemists' Association (MCA)
- Maricopa County Medical Society (MCMS)
- Marin County Chapter of the California Association of Marriage and Family Therapists (Marin CAMFT)
- Maryland Nurses Association (MNA)
- Maryland Psychological Association (MPA)
- Maryland State Board of Dental Examiners (MSBDE)
- Maryland State Dental Association (MSDA)
- Massachusetts Association for Mental Health (MAMH)
- Massachusetts Association of Colleges of Nursing (MACN)
- Massachusetts Association of Physician Assistants (MAPA)
- Massachusetts Coalition of Nurse Practitioners (MCNP)
- Massachusetts Dental Society (MDS)
- Massachusetts Gastroenterology Association (MGA)
- Massachusetts Medical Society (MMS)
- Massachusetts Mental Health Counselors Association (MAMHCA)
- Massachusetts Society of Interventional Pain Physicians (MSIPP)
- Max-Planck-Gesellschaft; Max Planck Society (Germany) (MPG)
- Medical Academy (MA)
- Medical Academy of Pediatric Specials Needs (MAPSN)
- Medical Artists' Association of Great Britain (MAAGB)
- Medical Assistance Administration (MAA)
- Medical Association of Eire (MAE)
- Medical Association of Georgia (MAG)
- Medical Committee for Human Rights (MCHR)
- Medical Corps - Army (MC)
- Medical Dermatology Society (MDS)
- Medical Library Association (MLA)
- Medical Literature Analysis and Retrieval System Online (MEDLINE)
- Medical Research Council of Ireland (MRCI)
- Medical Research Society (UK) (MRS)
- Medical Society for the Study of Venereal Diseases (MSSVD)
- Medical Society of London (UK) (MSL)
- Medical Society of New Jersey (MSNJ)
- Medical Society of the County of Erie (MSCE)
- Medical Society of the State of New York (MSSNY)
- Medical Society of Virginia (MVS)
- Medical Women's International Association (MWIA)
- Memphis Medical Society (MMS)
- Mental Health and Addiction Certification Board of Oregon (MHACBO)
- Mental Health Counselors of Central Florida (MHCCF)
- Mental Health First Aid (MHFA)
- Mental Health Research Institute (MHRI)
- Mental Health Service Corps (MHSc)
- Miami-Dade County Podiatric Medical Association (FPMA-Dade)
- Miami Society of Plastic Surgeons (MSPS)
- Michigan Academy of Nutrition and Dietetics (MiAND)
- Michigan Association for Counselor Education and Supervision (MACES)
- Michigan Association of Alcoholism and Drug Abuse Counselors (MAADAC)
- Michigan Association of Chiropractors (MAC)
- Michigan Association of Naturopathic Physicians (MANP)
- Michigan College of Emergency Physicians (MCEP)
- Michigan Council of Nurse Practitioners (MICNP)
- Michigan Counseling Association (MCA)
- Michigan Mental Health Counselors Association (MMHCA)
- Michigan Occupational Therapy Association (MiOTA)
- Michigan Optometric Association (MOA)
- Michigan Psychological Association (MPA)
- Michigan Society of Hematology and Oncology (MSHO)
- Michigan State Medical Society (MSMS)
- Mid-Atlantic Group Psychotherapy Society (MAGPS)
- Middle Atlantic Society of Orthodontists (MASO)
- Midwestern Vascular Surgical Society (MVSS)
- Midwives Alliance of North America (MANA)
- Military Birth Resource Network (MBRN)
- Minneapolis District Dental Society (MDDS)
- Minnesota Acupuncture Association (MAA)
- Minnesota Association for Marriage and Family Therapy (MAMFT)
- Minnesota Association of Resources for Recovery and Chemical Health (MARRCH)
- Minnesota Board of Chiropractic Examiners (MBCE)
- Minnesota Chiropractic Association Sports Council (MCASC)
- Minnesota Dental Association (MDA)
- Minnesota Occupational Therapy Association (MOTA)
- Mississippi Association of Nurse Practitioners (MANP)
- Mississippi Chiropractic Association (MCA)
- Mississippi Nurses Association (MSN)
- Missouri Academy of Physician Assistants (MOAPA)
- Missouri Association of Behavior Analysis (MOABA)