The Amyloidosis Research Consortium provides support, information, and resources for patients and caregivers affected by amyloidosis, helping them access the best care possible.

Amyloidosis Support Groups provides resources and support for individuals affected by amyloidosis, including treatment information and access to support groups.

The Anal Cancer Foundation supports individuals affected by anal cancer through community events, educational resources, and peer connections.

Anaphylaxis UK is a UK-wide charity dedicated to supporting individuals at risk of serious allergic reactions and anaphylaxis by providing information, training, and support to create a safer environment for those with allergies.

Angel Flight NE provides free air transportation and ground transportation for patients needing access to life-saving medical care.

The ASF exists to advance the awareness and treatment of Angelman syndrome through education and research.

Angelman Syndrome - UK Support, Education and Research Trust provides support and resources for individuals affected by Angelman Syndrome, focusing on education, fundraising, and research into treatments.

Aniridia Network is a charity that supports individuals with the rare genetic condition aniridia in the UK and Ireland, providing information, support, and resources for patients and their families.

ABC of Southwest Texas is a community-led organization that educates and empowers families of children with special healthcare needs, providing resources and support to navigate their healthcare journey.

The Adult Polyglucosan Body Disease Research Foundation is dedicated to finding a cure for Adult Polyglucosan Body Disease (APBD) and improving the lives of those affected by it.

The Aphasia Hope Foundation provides support and resources for individuals affected by aphasia, including information on therapy options and personal experiences of recovery.

The Aplastic Anemia and MDS International Foundation supports patients and families affected by aplastic anemia, myelodysplastic syndromes, and related bone marrow failure diseases by providing education, advocacy, and resources for treatment and support.

The Aplastic Anemia & Myelodysplasia Association of Canada (AAMAC) supports patients and caregivers affected by aplastic anemia, myelodysplastic syndrome, and paroxysmal nocturnal hemoglobinuria through research funding, educational materials, and peer support.

The Appendix Cancer Pseudomyxoma Peritonei Research Foundation funds research and educational programs to support patients and healthcare professionals dealing with appendix cancer and pseudomyxoma peritonei.

Apraxia Kids is dedicated to supporting children with childhood apraxia of speech by providing resources, community connections, and funding for research initiatives.

The Ara Parseghian Medical Research Foundation is a non-profit organization dedicated to funding medical research projects to find a treatment for Niemann-Pick Type C (NP-C) disease, a genetic disorder primarily affecting children.

The organization provides support, education, and research for individuals affected by Arginase 1 Deficiency (ARG1-D), a rare genetic disorder that impacts the urea cycle and can lead to severe health issues.

Arthritis Australia is dedicated to improving the quality of life for Australians living with arthritis through education, programs, and advocacy, while also funding research to enhance understanding and treatment of the condition.

Arthritis Society Canada is dedicated to supporting individuals affected by arthritis through research, advocacy, and educational resources.

AMCSI supports individuals and families affected by Arthrogryposis Multiplex Congenita (AMC) by providing resources, educational materials, and community connections.