- Tonagh
- Tonduff
- Tonduff
- Tonyduff
- Tonyglassan
- Tops
- Toralaydan Island
- Tormore Island
- Tory Island
- Tossy
- Treantagh
- Treantagh
- Treehog Cross Roads
- Trinity Island
- Trooperstown
- Tuam Island
- Tullagh
- Tullanacrunat
- Tully
- Tully
- Tully Beg
- Tully More
- Tullybegly
- Tullybrook
- Tullybryan
- Tullycarragh
- Tullychattina
- Tullycoe
- Tullydush
- Tullykinroe