Grass River (Michigan)
 The Grass River is a 2.3-mile-long (3.7 km) river in Antrim County in the U.S. state of Michigan. It is part of the Elk River Chain of Lakes Watershed that begins in northern Antrim County with Intermediate Lake which is connected by the Intermediate River with Lake Bellaire. The Grass River flows from Lake Bellaire into Clam Lake which in turn drains into Torch Lake via the short Clam River.