Titoki is a locality in the Mangakahia Valley of the Northland Region of New Zealand's North Island. Whangārei is 26 km to the east. The Wairua River passes to the east of Titoki, and the Mangakahia River to the west. A hydroelectric plant has been operating at Wairua Falls since 1916. It was upgraded to produce 5.4 Gwh per year in 2007.