| Little Trout River | |
| Source1 Location: | Adirondack Park |
| Mouth Location: | Franklin County, New York, New York State, (United States) |
| Progression: | Trout River (New York, Quebec) - Châteauguay River - Saint Lawrence River |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York State |
| Subdivision Type3: | Region |
| Subdivision Name3: | Adirondack Park (New York State) |
| Subdivision Type4: | Region |
| Subdivision Name4: | Franklin County, New York |
| Basin Size: | NaNkm2 |
| River System: | Saint Lawrence River |
| Tributaries Right: | Alder Brook |
The Little Trout River is a tributary of the Trout River, flowing in Adirondack Park, in Franklin County, New York, in New York State, in United States.
This valley is mainly served in New York, the nearby road is Constable Street and State Highway 30.
The river surface is generally frozen from mid-December to the end of March. Safe circulation on the ice is generally done from the end of December to the beginning of March. The water level of the river varies with the seasons and the precipitation.
The small Trout River rises at the mouth of a small lake located between Soulia Mountain and Baldy Mountain in the Adirondack Mountains, in Adirondack Park. This source is located southwest of Lower Chateauguay Lake, south of the Canada-US border, and north-west of Upper Chateauguay Lake.
From its source in Adirondack Park, the Little Trout River descends, according to the following segments:
The Little Trout River flows into a bend on the east bank of the Trout River, south of the Canada border. From there, the current descends the course of the Trout river on generally towards the north, then the northeast; then the course of the Châteauguay river on to the south shore of lac Saint-Louis, at Châteauguay, southwest of Montreal .