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- (Mayo County) Toncroaghaun
- (Mayo County) Tongree
- (Mayo County) Tawnaghlaur
- (Mayo County) Tawnaghmore
- (Mayo County) Tonatanvally
- (County Galway) Turloughmore
- (Roscommon) Tulsk
- (County Leitrim) Tullaghan
- (Mayo County) Turlough
- (County Galway) Tynagh
- (Mayo County) Toormakeady
- (Sligo) Tobercurry
- (County Galway) Tuam