T
- Tallaght Stream, County Dublin
- Tall*
- Tar
- River Tolka, County Dublin
- Torrent*
- Tempo*
- Termon*
- Three Arches*
- Threemilewater*
- Trimleston Stream, County Dublin
- Tromanallison, County Dublin
- Turnapin Stream, County Dublin
- Turvey River, County Dublin
Read more about this topic: Rivers Of Northern Ireland