|Main source||Southern Alps|
|River mouth||Karangarua River|
|Length||18 kilometres (11 mi)|
The Douglas River, formerly known as the Twain, is a river of the West Coast of New Zealand's South Island. Its source is high in the Southern Alps, five kilometres south of Mount Sefton, and its upper reaches are fed by water from the Douglas Glacier. It flows west for 18 kilometres, joined by runoff from the Horace Walker Glacier, before joining the waters of the Karangarua River. The Douglas River's entire course is within Westland Tai Poutini National Park. The river and glacier are named after Charles Edward Douglas, a 19th-century explorer and mountaineer.
- Douglas, Charlie; Pascoe, John Dobrée (2000-01). Mr Explorer Douglas: John Pascoe's New Zealand Classic. Canterbury University Press. ISBN 9780908812950. Retrieved 24 May 2015. Check date values in:
- Peter Dowling (editor) (2004). Reed New Zealand Atlas. Reed Books. Map 76. ISBN 0-7900-0952-8.
- Discover New Zealand:A Wises Guide (9th ed.). 1994. p. 293.
- "Horace Walker Hut". New Zealand Department of Conservation. Retrieved 14 August 2009.
- Land Information New Zealand - Search for Place Names
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