Fl
- Flag River - Wisconsin
- Flambeau River - Wisconsin
- Flat River - Michigan
- Flat River - North Carolina
- Flat River - Rhode Island (tributary of the South Branch Pawtuxet River)
- Flat River - Rhode Island (tributary of the Wood River)
- Flathead River - Montana
- Flatrock Creek - Indiana, Ohio
- Flatrock River - Indiana
- Flint River - Alabama, Tennessee
- Flint River - Georgia
- Flint River - Michigan
- Floyd River - Iowa
- Floyds Fork - Kentucky (Floyds Fork of the Salt River)
- Flushing River - New York
Read more about this topic: List Of Rivers Of The United States: F