There are two Deer Rivers in the North Country of New York.

Deer River – a tributary of St. Regis River

This river starts at the Deer River Flow, generally flowing north east to the Saint Regis River, through Deer River State Forest and Brasher Falls.

Deer River – a tributary of Black River

This river starts about 3 miles of Barnes Corners, north of Sears Pond State Forest, enters a deep gorge near Lookout State Forest, flows through Copenhagen and the village of Deer River.