Bo
- Boardman River - Michigan
- Boeuf River - Arkansas, Louisiana
- Bog River - New York
- Bogachiel River - Washington
- Bogue Falaya - Louisiana
- Bohemia River - Delaware, Maryland
- Bois Brule River - Wisconsin
- Bois de Sioux River - Minnesota, South Dakota, North Dakota
- Boise River - Idaho
- Bonpas Creek - Illinois
- Boone River - Iowa
- Bosque River - Texas
- Bouie River - Mississippi
- Boulder River - Montana (tributary of the Yellowstone River)
- Boulder River - Montana (tributary of the Jefferson River)
- Boulder River - Washington
- Bouquet River - New York
- Bourbeuse River - Missouri
- Boyer River - Iowa
Read more about this topic: List Of Rivers Of The United States: B