Poplar River may refer to:
Canada Manitoba Poplar River (Manitoba) Poplar River First Nation, a First Nation community astride the river in Manitoba Ontario Kenora District Poplar River (Atikameg River), part of the Kapiskau River system Poplar River (Fawn River), in the Severn River system Poplar River (Manitoba) (the upper reaches of which are in Ontario) Poplar River (Nipissing District), in Nipissing District, part of the French River system Poplar River (Montana–Saskatchewan), a tributary of the Missouri River in Saskatchewan in Canada and Montana in the United States United States Poplar River (Lake Superior), Minnesota Poplar River (Lost River), Minnesota Poplar River (Montana–Saskatchewan), a tributary of the Missouri River in Saskatchewan in Canada and Montana in the United States