The Guthy-Jackson Charitable Foundation focuses on funding research and advocacy for NeuroMyelitis Optica and its Spectrum Disorders, aiming to find life-saving cures and improve patient lives.

HCU Network America provides resources and support for patients and families affected by Homocystinurias, advocating for better diagnosis and treatment options.

HCU Network Australia is a health promotion charity focused on improving health outcomes for individuals with Classical Homocystinuria (HCU) through education, research, and support.

The HNRNP Family Foundation is dedicated to improving the lives of patients and families affected by rare HNRNP-Related Neurodevelopmental Disorders through research, education, and community support.

HPV Cancers Alliance is a national nonprofit dedicated to reducing the burden of HPV through education, prevention, and advocacy, providing evidence-based information on HPV infection, vaccination, and cancer prevention.

The HSAN1E Society raises awareness and provides support for families affected by Hereditary Sensory and Autonomic Neuropathy, Type 1E (HSAN1E) and similar DNMT-1 complex disorders.

This organization supports individuals affected by craniosynostosis and other rare craniofacial conditions, providing resources and confidential support.

The Healing Exchange BRAIN TRUST provides support to individuals affected by brain tumors through online support groups, fostering a community for sharing experiences and coping strategies.

Healing the Children Northeast provides free surgical, dental, and medical treatment for underserved children globally through various programs, including medical teams abroad and an international inbound program.

The Health Resources and Services Administration (HRSA) provides a variety of health services, including support for maternal mental health, HIV care, and access to health centers for underserved communities.

Hearing Health Foundation (HHF) is dedicated to preventing and curing hearing loss and tinnitus through research and promoting hearing health.

The Hearing Loss Association of America (HLAA) provides education, advocacy, and support for individuals with hearing loss, helping them thrive in their daily lives.

The Heart Foundation is dedicated to improving heart health for Australians by providing resources, support programs, and funding research to combat heart disease.

Help Hope Live is a nonprofit organization that provides fundraising support for individuals facing medical expenses not covered by insurance.

Helping Hands for GAND supports individuals and families affected by GATAD2B-associated neurodevelopmental disorder (GAND), focusing on increasing awareness and promoting research and treatment opportunities.

Envisioning Access supports individuals with physical disabilities by improving mobility, access, and quality of life through advocacy and innovative technology solutions.

The Hemophilia Federation of America supports individuals and families affected by bleeding disorders through education, advocacy, and community events.

The Hemophilia Foundation of Southern California is a leading resource for individuals affected by bleeding disorders, providing education, advocacy, and support services across nine counties in Southern California.

Henshaws supports people living with sight loss and a range of other disabilities, providing services such as education, arts and crafts, and support programs to help individuals achieve their ambitions.

The Hepatitis B Foundation is a global nonprofit dedicated to finding a cure and improving the quality of life for people affected by hepatitis B.