Mo
- Mobile River - Alabama
- Mohawk River - New Hampshire
- Mohawk River - New York
- Mohawk River - Oregon
- Mohican River - Ohio
- Mohlendorph Creek - Washington
- Mojave River - California
- Mokelumne River - California
- Molalla River - Oregon
- Monatiquot River - Massachusetts
- Monday Creek - Ohio
- Monocacy River - Maryland
- Monongahela River - West Virginia, Pennsylvania
- Montello River - Wisconsin
- Montreal River - Michigan Keweenaw Peninsula
- Montreal River - Michigan-Wisconsin border
- Moormans River - Virginia
- Moose River - New Hampshire
- Moose River - New York
- Moose River - Wisconsin
- Moosup River - Rhode Island, Connecticut
- Moreau River - South Dakota
- Moshassuck River - Rhode Island
- Mosquito Creek - Iowa
- Moswansicut River - Rhode Island
- Mount Hope River - Connecticut
- Mountain Fork - Arkansas, Oklahoma
- Mousam River - Maine
- Mowich River - Washington
- Moxahala Creek - Ohio
- Moyie River - Idaho, British Columbia
Read more about this topic: List Of Rivers Of The United States: M