Rock River may refer to:
Streams
- United States
- Rock River (Mississippi River tributary), a tributary of the Mississippi River in Wisconsin and Illinois
- Rock River (Big Sioux River tributary), a tributary of the Big Sioux River in Minnesota and Iowa
- Rock River (Lake Michigan), a tributary of Lake Michigan in Michigan
- Rock River (Lake Superior), a tributary of Lake Superior in Michigan
- Rock River (Sturgeon River tributary), a tributary of the Sturgeon River in Michigan
- Rock River (Lake Champlain), a tributary of Lake Champlain in northern Vermont
- Rock River (West River tributary), a tributary of the West River in southern Vermont
- Little Rock River, in Minnesota and Iowa in the United States
- Canada
- Rock River (Yukon), a tributary of the Bell River; see List of rivers of Yukon
Communities
- Rock River, Michigan, in Onota Township, Michigan, USA
- Rock River Township, Michigan, USA
- Rock River, Wyoming, USA
- Rock River, a community in Clarendon, Jamaica
Other uses
- Rock River Arms, an American firearms company
- Rock River Generating Station, Wisconsin, USA
- Rock River Hotel, Illinois, USA
- Rock River Music, music branding agency in San Francisco, CA and Putney, VT
- Rock River Raptors, professional indoor football team in Rockford, Illinois, USA
- Rock River Seminary, original name of Mount Morris College in Mount Morris, Illinois, USA
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