Kawhia Harbour is one of three large natural inlets in the Tasman Sea coast of the Waikato region of New Zealand's North Island. It is located to the south of Raglan Harbour, Ruapuke and Aotea Harbour, 40 kilometres southwest of Hamilton. Kawhia is part of the Ōtorohanga District and is in the King Country. It has a high-tide area of 68 km2 (26 sq mi) and a low-tide area of 18 km2 (6.9 sq mi). Te Motu Island is located in the harbour.