The Lester River, is a 19.3-mile-long (31.1 km)[1] tributary of Lake Superior, in northeastern Minnesota in the United States.

The Lester River flows for its entire length in southern Saint Louis County.

It rises in Gnesen Township and flows generally southeastwardly through the city of Rice Lake and Lakewood Township, turning southward as it nears Lake Superior.

Lester River bears the name of an early settler.

[2] Along the Lester River are two properties listed on the National Register of Historic Places.