SPOHNC is dedicated to raising awareness and meeting the needs of oral and head and neck cancer patients through its resources and publications.

SAKKS supports families and caregivers of children with Kabuki Syndrome by providing information, resources, and community connections.

SOFT UK is dedicated to providing support for families affected by Trisomy 13 and Trisomy 18, ensuring they have access to resources and a safe space to share their experiences.

SOFT is a patient advocacy organization that supports families with children diagnosed with Trisomy 18, 13, and related chromosomal disorders by providing resources, information, and a supportive community.

Riksförbundet Sällsynta diagnoser is an advocacy organization in Sweden that works to improve conditions for individuals with rare health conditions and their families, representing their interests to decision-makers and enhancing healthcare and support services.

The SYNGAP1 Foundation is dedicated to improving the lives of families affected by SYNGAP1 and related overlapping neurological disorders through advocacy, education, and research initiatives.

TCOYD educates and motivates people with diabetes to take an active role in managing their condition and provides continuing education for healthcare professionals.

The TANGO2 Research Foundation is dedicated to improving the lives of those affected by TANGO2 deficiency disorder through research, advocacy, and support for families.

TargetCancer Foundation advocates for individuals diagnosed with rare cancers by advancing research and connecting the rare cancer community to improve treatment options.

The Tarlov Cyst Disease Foundation promotes research and education about Tarlov cysts, providing support and resources for patients and advocating for awareness within the medical community.

The organization supports families affected by Tatton Brown Rahman Syndrome (TBRS) by advancing research, providing resources, and fostering a community for patients, families, and clinicians.

Team PHenomenal Hope is dedicated to improving the lives of patients with pulmonary hypertension through various initiatives, including research awards and community support.

Team Telomere is dedicated to supporting individuals affected by Telomere Biology Disorders through information, advocacy, and community resources, while also advancing research for effective treatments and cures.

The TED Community Organization is dedicated to supporting individuals affected by Thyroid Eye Disease (TED) and Graves' Disease by providing trusted information, emotional support, and community connection.

TDI promotes equal access in telecommunications and media for individuals who are deaf, hard of hearing, late deafened, or deaf blind, providing education, technical assistance, and advocacy for accessibility issues.

The Texas Neurofibromatosis Foundation is a nonprofit organization dedicated to supporting individuals affected by neurofibromatosis through education, advocacy, and funding research for treatment and prevention.