Stillwater River
Stillwater River may refer to:
Rivers in New Zealand:
- Stillwater River (New Zealand), on the South Island
Rivers in the United States:
- Stillwater River (Maine)
- Stillwater River (Nashua River), Massachusetts
- Stillwater River (Stillwater County, Montana), a tributary of the Yellowstone River
- Stillwater River (Flathead County, Montana), a tributary of the Whitefish River
- Stillwater River (Ohio)
- Stillwater River (Rhode Island)