| Trothy | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Wales |
| Subdivision Type3: | Region |
| Subdivision Name3: | Monmouthshire |
| Source1 Location: | Monmouthshire, Wales |
| Mouth: | River Wye |
| Mouth Location: | Monmouth, Wales |
| Mouth Coordinates: | 51.8012°N -2.7036°W |
The River Trothy (Welsh: '''Afon Troddi''') is a river which flows through north Monmouthshire, in rural south east Wales. It is a tributary of the River Wye.[1] [2]
The river rises on Campston Hill, northeast of Abergavenny. It flows southwards until Llanvapley, where it turns east. About south of Monmouth the river joins the confluence of the River Wye and the River Monnow.