Rainy River can refer to:
The Rainy River is a short river of the northeastern Tasman Region of New Zealand's South Island. It flows north from the Richmond Range into the Pelorus River, which it reaches five kilometres west of Pelorus Bridge.
Coordinates: 41°19′39″S 173°30′46″E / 41.32750°S 173.51278°E / -41.32750; 173.51278
The Rainy River (French: Rivière à la Pluie; Ojibwe: Gojiji-ziibi) is a river, approximately 137 kilometres (85 mi) long, which forms part of the U.S.-Canada border separating northern Minnesota and Northwestern Ontario.
It issues from the west side of Rainy Lake (French: lac à la Pluie; Ojibwe: Gojiji-zaaga'igan) and flows generally west-northwest, between International Falls, Minnesota, and Fort Frances, Ontario, and between Baudette, Minnesota, and Rainy River, Ontario. It enters the southern end of Lake of the Woods approximately 19 kilometres (12 mi) northwest of Baudette/Rainy River. It is used for hydroelectricity at International Falls. The town of Rainy River was named after it; the Couchiching First Nation and Koochiching County, Minnesota are named after the Ojibwa's name for the river and the lake. The drainage basin of the river stretches east to the height of land about 100 kilometres (62 mi) west of Lake Superior, where it was the southeast corner of the huge tract of land granted to the Hudson's Bay Company in 1670. It ultimately drains through the Winnipeg River, Lake Winnipeg and the Nelson River into Hudson Bay.