Nakatsu is a city on the northern border of Ōita Prefecture in Kyushu, Japan. As of 31 October 2023, the city had an estimated population of 82,301 in 41222 households, and a population density of 96 persons per km2. The total area of the city is 491.53 km2 (189.78 sq mi).

Daihatsu Motor Co., Ltd. , commonly known as Daihatsu, is a Japanese automobile manufacturer and one of the oldest surviving Japanese internal combustion engine manufacturers. The company's headquarters are located in Ikeda, Osaka Prefecture.