Lake Mégantic (French: Lac Mégantic, French pronunciation: [lak meɡɑ̃tik]) is a large body of water in Québec, Canada, located in the Appalachian Mountains near the U.S. border.

[1] The lake has a surface area of 26.4 km2 (10.2 sq mi) with several villages and small towns on its shores, including Lac-Mégantic, Frontenac, Marston, and Piopolis.

[2] The name may derive from Namagôntekw, which in the Abenaki language means place where there is trout in the lake.

The name has had many variants, including Amaguntik on maps documenting the 1775 American invasion of Quebec.

[3] The water surface is 395 m (1,296 ft) above mean sea level and the lake has an average depth of 75 m (246 ft); its total surface area is 26.4 square kilometres (10.2 sq mi), with a total shoreline of 45.4 km (28.2 mi).