Trout Lake, also known as Trout Lake City, is an unincorporated rural community and former mining and railway-speculation boomtown located at the north end of Trout Lake in the West Kootenay district of southeastern British Columbia, Canada. Trout Lake (the lake) is at the head of the Lardeau River, which runs as does the lake on a southeastern course to the community of Lardeau at the north end of Kootenay Lake, while beyond it and the townsite of Trout Lake at its northwestern end is a low pass to the Beaton Arm of Upper Arrow Lake at Galena Bay. Speculation on railway development through this pass promoted a great amount of speculation at Trout Lake, or Trout Lake City as it soon was proclaimed to be, as well as at Lardeau and other potential townsites along the rail line's route.
Halcyon Hot Springs, originally a railway-era resort, is located approximately thirty minutes away on Highway 31 (later 23). The Windsor Lodge Trout Lake BC has a restaurant and bar and there is also a gas station/convenience store located within Trout Lake City. A coffee shop/cafe, the No-Board Cafe opened in 2006 in Trout Lake City. Long term residents do most of their grocery shopping in Nakusp, the nearest town, about forty-five minutes away.