The Churchill River (French: Rivière Churchill) is a major river in Alberta, Saskatchewan and Manitoba, Canada. From the head of the Churchill Lake it is 1,609 kilometres (1,000 mi) long. It was named after John Churchill, 1st Duke of Marlborough and governor of the Hudson’s Bay Company from 1685 to 1691.
The Cree name for the river is Missinipi, meaning “big waters”.[
The river is located entirely within the Canadian Shield. The drainage basin includes a number of lakes in Central-East Alberta which flow into a series of lakes in Saskatchewan and Manitoba. The main tributary, the Beaver River (Canada), joins at Lac Île-à-la-Crosse.