Atsugi is a city located in Kanagawa Prefecture, Japan. As of 1 June 2021, the city had an estimated population of 223,960 and a population density of 2400 persons per km2. The total area of the city is 93.83 square kilometres (36.23 sq mi). While the name "Atsugi" is often associated with the United States Navy base named Naval Air Facility Atsugi, the base is actually not in Atsugi, but straddles the border between the nearby cities of Ayase and Yamato.

Kanagawa Prefecture is a prefecture of Japan located in the Kantō region of Honshu. Kanagawa Prefecture is the second-most populous prefecture of Japan at 9,221,129 and third-densest at 3,800 inhabitants per square kilometre (9,800/sq mi). Its geographic area of 2,415 km2 (932 sq mi) makes it fifth-smallest. Kanagawa Prefecture borders Tokyo to the north, Yamanashi Prefecture to the northwest and Shizuoka Prefecture to the west.