R
- River Delvin, County Dublin
- Racecourse Stream, County Dublin
- Reelan*
- Richardstown River, County Dublin
- Robe, County Mayo
- Robinhood Stream, County Dublin
- Roe*
- Roogagh*
- Rosserk River, County Mayo
- Roughty
- Rush Town Stream, County Dublin
Read more about this topic: Rivers Of Northern Ireland