Tetrasomy/ Pentasomy X Support Group (Tetrasomy X, Pentasomy X)

Thalassemia Foundation of Canada (Thalassemia)

Thrombocytopenia Absent Radius Syndrome Association (T.A.R.S.A.) (Thrombocytopenia Absent Radius Syndrome)

Thyroid Foundation of Canada (Thyroid Disease, Graves Disease, Hypothyroidism)

TOFS (Trachael Oesophageal Fistula Support Group) Tracheal Oesophageal Fistula, Oesphageal Atresia, VATER, VACTERL)

Tourette Syndrome Foundation of Canada (Tourette Syndrome)

Trigeminal Neuralgia Association (Trigeminal Neuralgia)

Tuberous Sclerosis Alliance (Tuberous Sclerosis)

Tuberous Sclerosis Canada Sclérose Tubéreuse (Tuberous Sclerosis)

Turner Syndrome Society of Canada (Turner's Syndrome, Short Stature)

Turner Syndrome Society of the US (Turner's Syndrome, Short Stature)