Mōkau is a small town on the west coast of New Zealand's North Island, located at the mouth of the Mōkau River on the North Taranaki Bight. Mōkau is in the Waitomo District and Waikato region local government areas, just north of the boundary with the New Plymouth District and the Taranaki Region. Prior to 1989, the town was classed as being in Taranaki, and there is still a feeling that the community of interest is most associated with New Plymouth, 90 km to the southwest. State Highway 3 passes through the town on its route from Te Kūiti to Waitara and, eventually, New Plymouth.

Waitomo District is a territorial authority, located in the Waikato region, at the north of the King Country area in the North Island of New Zealand. A small part of the district, the locality of Tiroa, however, lies in the Manawatū-Whanganui region.