Macular Degeneration Foundation (Macular Degeneration, Visual Impairment)

Magic Foundation for Children's Growth (Growth Disorders, Growth Hormone Deficiency, McCune Albright Syndrome, Congenital Adrenal Hyperplasia, Precocious Puberty, Growth Retardation in Down Syndrome)

MAAP More advanced individuals with Autism, Asperger's syndrome, and Pervasive developmental disorder (PDD) (Asperger Syndrome)

Malignant Hyperthermia Association of the Untied States (MHAUS) (Malignant Hyperthermia)

Marden Walker Family Support Group (MWSG) (Marden Walker Syndrome)

Marinesco Sjogren Syndrome Support Group (Marinesco Sjogren Syndrome-MSS)

Melnick-Needles Syndrome Support Group (Melnick-Needles Syndrome)

MHE Coaltion ( Multiple Hereditary Exostoses)

MHE Research Foundation ( Multiple Hereditary Exostoses)

MLD Foundation (Metachromatic Leukodystrophy)

ML4 Foundation (Mucolipidosis IV Foundation) (Mucolipidosis Type IV)

Moebius Syndrome Foundation (Moebius Syndrome, Facial Deformities)

Multiple Sclerosis Society of Canada (Multiple Sclerosis)

Muscular Dystrophy Canada (Muscular Dystrophy, Charcot-Marie-Tooth Disease, Duchenne Muscular Dystrophy, Limb Girdle Dystrophy, Myotonic Dystrophy, Spinal Muscular Atrophy-SMA)

Myasthenia Gravis Foundation of America (Myasthenia Gravis)

(The) Myelin Project (Leukodystrophies)

Myoclonis Research Foundation (Myoclonus)

Myotubular Myopathy Resource Group (Myotubluar Myopathy)