| Lake Frontier | |
|---|---|
&sq=&lang=&file=File:Canada_Quebec_relief_location_map.jpg)  Lake Frontier | |
| Location | Lac-Frontière, Montmagny, Chaudière-Appalaches, Quebec |
| Coordinates | 46°42′24″N 70°00′04″W / 46.70667°N 70.00111°W |
| Primary inflows | Northwest Branch Black River |
| Primary outflows | Northwest Branch Saint John River |
| Basin countries | Canada |
| Max. length | 1.8 kilometres (1.1 mi) |
| Max. width | 0.7 kilometres (0.43 mi) |
| Surface elevation | 347 metres (1,138 ft) |
| Settlements | Lac-Frontière, Quebec |
The Lake Frontier is a lake located entirely in the municipality of Lac-Frontière, Quebec in regional county municipality (RCM) Montmagny in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.
From 1915, the small town South of the lake, called "Lac-Frontière" (English: Lake-Frontier), has had some development through the terminus of the Central Quebec railway.
In the nineteenth and twentieth centuries, the forest industry was the main economic activity of the region. Upon arrival of the railroad, the recreational and tourist vocation of the region has significantly developed.