Lac-Mégantic, Qué, Town, pop 5967 (2006c), 5897 (2001c), inc 1907. Lac-Mégantic is located on the northeastern shore of LAC MÉGANTIC, 95 km east of SHERBROOKE. On nearby Mont Mégantic (1105 m) are located a nature and astronomy interpretation centre (ASTROLab), a conservation park and an astronomical OBSERVATORY. The observatory, with its 1.6 m diameter telescope, is shared by Université de Montréal and Laval.

Rivière CHAUDIÈRE starts in Lac Mégantic, the name of which in ABENAKI means "the place of salmon trout." The river was a traditional route of the Abenaki. The first settlers (SCOTS) arrived at Lac Mégantic in the mid-19th century. After 1895 a branch of the Québec-Central rail line linked Lac-Mégantic to LÉVIS.

Today the town, a commercial and industrial crossroads and tourist site, is a service centre for the surrounding region and features the large Baie-des-Sables recreational complex.