The Melanoma Research Foundation (MRF) is dedicated to eradicating melanoma through research, education, and advocacy for patients and their families affected by this deadly form of skin cancer.

The Melorheostosis Association is dedicated to finding the cause, treatments, and cure for melorheostosis, a rare and progressive bone disorder, while promoting awareness and providing support for affected individuals and their families.

Memorial Sloan Kettering Cancer Center is dedicated to providing personalized cancer treatment and conducting cutting-edge research to improve cancer care and outcomes.

Mended Hearts is the nation's largest cardiac peer-to-peer support group, providing support to heart patients, their families, and caregivers for various heart diseases.

The Meningitis Foundation of America raises awareness and provides resources to help protect individuals and families from meningitis, a potentially deadly disease.

The Meningitis Research Foundation is dedicated to defeating meningitis through awareness, fundraising, and supporting research efforts, while connecting a global network of organizations and individuals affected by the disease.

Mental Health America is a national nonprofit organization dedicated to promoting mental health, well-being, and condition prevention, providing resources and advocacy for mental health support.

The Mesothelioma Applied Research Foundation is dedicated to ending mesothelioma by funding research, providing treatment support and education for patients and their families, and advocating for federal funding of research.

Metabolic Support UK provides support for individuals living with inherited metabolic disorders, offering one-to-one assistance, community connection, and access to reliable information.

The Miller School of Medicine focuses on medical education and research, particularly in areas such as diabetes, cancer care, and precision medicine, while also providing community outreach and patient care services.

MACS is a charity that supports children and adults born with Microphthalmia, Anophthalmia, or Coloboma, providing peer support, practical help, and opportunities for life-changing activities.

Mila's Miracle Foundation advocates for children suffering from genetic diseases like Batten disease and aims to develop individualized medicines to provide them with a second chance at life.

Mission MSA is dedicated to supporting individuals affected by Multiple System Atrophy (MSA) through community building, resources for managing symptoms, and advocacy for research and clinical trials.

Mission: Cure is a nonprofit organization focused on finding effective treatments and a cure for pancreatitis, a painful disease affecting both children and adults, by collaborating with patients, caregivers, and medical experts.

MitoAction is dedicated to improving the quality of life for individuals and families affected by mitochondrial disease through support, education, outreach, advocacy, and clinical research initiatives.

MIUSA empowers people with disabilities around the world to achieve their human rights through international exchange and international development.

The Moebius Syndrome Foundation supports individuals with Moebius syndrome by providing resources, funding research, and hosting conferences to build community and awareness.

The MND Association supports individuals affected by motor neurone disease (MND) in England, Wales, and Northern Ireland by providing information, financial support, and access to local resources.

The Mouth Cancer Foundation is dedicated to raising awareness, educating, and promoting the early detection of mouth cancer, while supporting patients, carers, and survivors affected by head and neck cancers.