Lake Annecy is a perialpine lake in Haute-Savoie in France. It is named after the city of Annecy, which marks the start of the Thiou, Lake Annecy's outflow river. It is the third-largest lake in France, after the Lac du Bourget and Lac de Grand-Lieu, if the French part of Lake Geneva, which is shared between Switzerland and France, is excluded. It is a popular tourist destination known for its swimming and water sports. The lake was formed about 18,000 years ago, at the time the large alpine glaciers melted. It is fed by many small rivers from the surrounding mountains (Ire, Eau morte, Laudon, Bornette and Biolon) and a powerful underwater source, the Boubioz, at an 82-metre depth (269 ft).

Cities and towns around the lake

A cycle path goes partially around Lake Annecy past Sevrier and St Jorioz to Ugine. It has an aim to reach Albertville. The lake is around 14 km long.