| Name | Diocese | Function | Species |
| St Seiriol, Penmon | Bangor | Daughter Church | 7 |
| St Tanwg, Llandanwg | Bangor | Daughter Church | 0 |
| St Tecwyn (and Lychgate), Llandecwyn | Bangor | Daughter Church | 2 |
| St Thomas, Newborough | Bangor | Daughter Church | 0 |
| St Tudno, Great Orme | Bangor | Daughter Church | 0 |
| St Twrog, Bodwrog | Bangor | Daughter Church | 4 |
| St Tyfrydog, Llandyfrydog | Bangor | Daughter Church | 6 |
| St Tysilio, Menai Bridge | Bangor | Daughter Church | 319 |
