Coldwater River is a 29.5-mile-long (47.5 km)[1] stream in the U.S. state of Michigan.

Located in Branch County, the river rises in Ovid Township at 41°50′14″N 84°59′13″W / 41.83722°N 84.98694°W / 41.83722; -84.98694 as the outflow of Coldwater Lake.

It then continues to the northwest and empties into the St. Joseph River in the village of Union City at 42°03′58″N 85°07′48″W / 42.06611°N 85.13000°W / 42.06611; -85.13000.

[2] The Coldwater River drainage basin includes nearly the entire eastern half of Branch County and portions of Allen and Reading townships in western Hillsdale County.

This article related to a river in Michigan is a stub.