G
- Gallanstown Stream, County Dublin
- Gallblack Stream, County Dublin
- Garavogue
- Gay Brook Stream, County Dublin
- Glashoreag River, County Kerry
- Glasthule Stream, County Dublin
- Glen*
- Glenamoy River, County Mayo
- Glenamuck Stream, County Dublin
- Glenariff*
- Glenaulin Stream, County Dublin
- Glencullen River, County Dublin
- Glendergan*
- Glenelly*
- Glenglassera River, County Mayo
- Glenmornan*
- Glenulra River, County Mayo
- River Glyde, County Louth
- Golf Stream, County Dublin
- Goul
- Grange Stream, County Dublin
- Griffeen River, County Dublin
- Gweebarra
Read more about this topic: Rivers Of Northern Ireland