Unorganized Rainy River District is an unorganized area in the Rainy River District of Ontario, Canada, comprising all communities in the district which are not part of incorporated municipalities. Quetico Provincial Park is located entirely within this area. The area has gradually been reduced in size as portions of it were annexed by surrounding incorporated townships. In 2004, the Township of Morley annexed the geographic townships of Sifton and Dewart, thereby splitting Unorganized Rainy River into two non-contiguous areas.