Arapuni is a rural town centre on the Waikato river in the South Waikato District of New Zealand. The town sits next to the Arapuni Dam, a hydroelectric dam at Lake Arapuni commissioned in 1929. The Arapuni Power Station consists of eight turbines which give a total output of 196 MW, the largest of the power stations on the Waikato river. The Arapuni hydro station is owned and operated by Mercury Energy.

South Waikato District is a local government district in the Waikato Region of the North Island of New Zealand. It is located between the cities of Hamilton to the north, Rotorua to the east, Taupo to the south and Ruapehu District to the west.