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| Llugwy | |
|---|---|
 River Llugwy upstream of Betws-y-Coed | |
 | |
| Native name | Afon Llugwy (Welsh) |
| Location | |
| Country | Wales |
| Physical characteristics | |
| Source | |
| • location | Ffynnon Llugwy |
| Mouth | |
• location | confluence with River Conwy |
| Length | 40 km (25 mi) |
River Llugwy (Welsh: Afon Llugwy) is a tributary of the River Conwy, and has its source at Ffynnon Llugwy, a lake in the Carneddau range of mountains in Snowdonia in north-west Wales.