NTM Info & Research supports individuals affected by nontuberculous mycobacterial (NTM) lung disease and bronchiectasis, providing education, advocacy, and resources for patients and healthcare providers.

The Bijniervereniging supports individuals with adrenal disorders, providing information and advocacy services to connect patients and address their needs.

Nail Patella Syndrome Worldwide is the official organization of the NPS Community, supporting individuals affected by Nail Patella Syndrome, a hereditary condition characterized by various physical abnormalities and associated health issues.

Naitbabies is a patient advocacy organization focused on fetal and neonatal alloimmune thrombocytopenia (FNAIT), providing support and resources for affected families and promoting awareness and research about the condition.

The Narcolepsy Network provides benefits and services for individuals living with Narcolepsy and Idiopathic Hypersomnia, including educational resources, support groups, and clinical information.

The Nathaniel Adamczyk Foundation is dedicated to preventing common childhood infections from progressing to Acute Respiratory Distress Syndrome in children.

The National Adrenal Diseases Foundation (NADF) supports individuals affected by adrenal diseases such as Addison's disease and Cushing's syndrome, providing education, resources, and advocacy for patients and their families.

NAMI is the National Alliance on Mental Illness, the nation's largest grassroots mental health organization dedicated to providing support, education, and advocacy for individuals affected by mental illness.

The National Alopecia Areata Foundation (NAAF) supports individuals affected by alopecia areata through advocacy, education, and community engagement, while also funding research for treatments.

The National Axial Spondyloarthritis Society supports individuals living with axial spondyloarthritis (axial SpA) by providing resources, community engagement, and fundraising initiatives.

The National Aphasia Association supports individuals affected by aphasia, providing resources, community support, and information to help them navigate communication challenges.

Crohn's & Colitis UK is dedicated to supporting individuals living with Crohn's disease and ulcerative colitis by providing information, resources, and community support to help them live well with these conditions.

The National Association For Continence provides education and support for patients and caregivers dealing with incontinence, a treatable medical condition affecting bladder and bowel health.

NADD is an organization that supports individuals with intellectual and developmental disabilities and co-occurring mental health conditions through various programs, publications, and conferences.

The National Association of Laryngectomee Clubs provides services and support to laryngectomees and their families, offering information and resources related to laryngectomy.

The National Association of State Mental Health Program Directors (NASMHPD) represents the public mental health service delivery system in the U.S., providing support and resources for state mental health authorities.

The NAD is the nation's premier civil rights organization for deaf and hard-of-hearing individuals in the United States, advocating for their rights and providing support services.

The National Bleeding Disorders Foundation is dedicated to finding cures for inheritable blood and bleeding disorders and to addressing and preventing the complications of these disorders through research, education, and advocacy.

The National Blood Clot Alliance is a nonprofit organization dedicated to advancing the prevention, early diagnosis, and treatment of life-threatening blood clots, including deep vein thrombosis and pulmonary embolism, through public awareness and education.

The National Board for Respiratory Care (NBRC) supports respiratory therapists by providing credentialing and specialty certifications, ensuring high standards of care in respiratory therapy.