Stillwater River

Stillwater River may refer to:

New Zealand

 * Stillwater River (New Zealand), on the South Island

United States

 * Stillwater River (Maine)
 * Stillwater River (Nashua River tributary), 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)