Waiau River is the name of several rivers in New Zealand:
Waiau River (Coromandel) in the Thames-Coromandel District Waiau River (Gisborne) Waiau River (Hawke's Bay) Waiau River (Southland) Waiau Uwha River, Canterbury, formerly called the Waiau River Waiho River, West Coast region, traditionally the Waiau River
See also Waiaua River (disambiguation)