Lake Vyrnwy
General data
- Name: Lake Vyrnwy
- Water system: River Severn
- Water type: Artificial lake
- Progression: Vyrnwy River -> River Severn -> Severn Estuary -> Bristol Channel -> Celtic Sea -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: Europe
- Countries: Wales (UK)
Lake Vyrnwy is a reservoir in Powys, Wales, built in the 1880s for Liverpool Corporation Waterworks to supply Liverpool with fresh water. It flooded the head of the Vyrnwy valley and submerged the village of Llanwddyn.