Willow River may refer to:
Canada Willow River (British Columbia), tributary of the Fraser River originating in the Cariboo goldfields, Canada Willow River, British Columbia, a community, Canada
United States Willow River, Minnesota, a community at the confluence of the Kettle and Willow Rivers, Pine County, U.S. Willow River (Kettle River tributary), in Pine County, Minnesota, U.S. Willow River (Little Fork River tributary), in Minnesota, U.S. Willow River (Mississippi River tributary), in Minnesota, U.S. Willow River (St. Croix River tributary), in St. Croix County, Wisconsin, U.S. Willow River (Tomahawk River tributary), in Oneida County, Wisconsin, U.S.
See also Big Willow River, a tributary of James Bay in Ontario, Canada Little Willow River (Mississippi River tributary), in Aitkin County, Minnesota, U.S. Hudson, Wisconsin, a city formerly known as "Willow River" Willow River State Park, a state park in St. Croix County, Wisconsin, U.S.