- Thomas, Arthur Spencer Vaughan
- Thomas, Benjamin Bowen
- Thomas, Brinley
- Thomas, Ceinwen Hannah
- Thomas, Colin
- Thomas, David
- Thomas, David Wynne
- Thomas, Frazer
- Thomas, Huw
- Thomas, John Lloyd
- Thomas, Lawrence
- Thomas, M. Wynn
- Thomas, Mair
- Thomas, Margaret Ethelwynne
- Thomas, Morris
- Thomas, Norman Percy
- Thomas, Onfel
- Thomas, Rhys Maldwyn
- Thomas, Richard
- Thomas, Roger
- Thomas, Roland
- Thomas, W. Gwyn
- Thomas, William Jenkyn
- Thomas, William John
- Thomas, Wyn
- Thorley, Mary
- Thurston, Luke
- Tibbott, Gildas
- Tilsley, Gwilym Richard
- Tomos, Deri
- Treharne, Donald
- Troughton, William
- Tudur, Gwilym
- Turvey, Roger
- Twigg, Seth Armstrong