List of rivers in the United States: O

This is a list of rivers in the United States that have names starting with the letter O. For the main page, which includes links to listings by state, see List of rivers in the United States.

O

• Oak Orchard River - New York
• Oatka Creek - New York
• Obed River - Tennessee
• Obey River - Tennessee
• Obion River - Tennessee
• Occoquan River - Virginia
• Ocheyedan River - Iowa
• Ocklawaha River - Florida
• Ocmulgee River - Georgia
• Ocoee River - Georgia, Tennessee
• Oconee River - Georgia
• Oconomowoc River - Wisconsin
• Ogeechee River - Georgia
• Ohio Brush Creek - Ohio
• Ohio River - Pennsylvania, Ohio, West Virginia, Kentucky, Indiana, Illinois
• Ohoopee River - Georgia
• Okanogan River - Washington
• Old River - Louisiana
• Old River - New Hampshire
• Olentangy River - Ohio
• Oliverian Brook - New Hampshire
• Ompompanoosuc River - Vermont
• One Hundred and Two River - Iowa, Missouri
• Oneida River - New York
• Onion River - Wisconsin (tributary of Lake Superior)
• Onion River - Wisconsin (tributary of Sheboygan River)
• Ontonagon River - Michigan
• Oolenoy River - South Carolina
• Oostanaula River - Georgia
• Opequon Creek - Virginia, West Virginia
• Oriskany Creek - New York
• Osage River - Missouri
• Ossipee River - New Hampshire, Maine
• Oswegatchie River - New York
• Oswego River - New Jersey
• Oswego River - New York
• Otselic River - New York
• Ottauquechee River - Vermont
• Ottawa River - Ohio (tributary of Auglaize River)
• Ottawa River - Ohio (tributary of Lake Erie)
• Otter Brook - New Hampshire
• Otter Tail River - Minnesota
• Ouachita River - Arkansas, Louisiana
• Ounce River - Wisconsin
• Overpeck Creek - New Jersey
• Owens River - California
• Owyhee River - Nevada, Idaho, Oregon
• Oyster River - New Hampshire