Wanganui River
- This article is about the Wanganui River in the South island of New Zealand. For the river of the southwestern North Island, formerly called the Wanganui, see Wanganui River
The Wanganui River is in the West Coast of the South Island of New Zealand. It flows northwest for 55 kilometres (34 mi) from its headwaters in the Southern Alps, entering the Tasman Sea near Lake Ianthe, 40 kilometres (25 mi) southwest of Hokitika.