Ōtawara is a city located in Tochigi Prefecture, Japan. As of 1 July 2020, the city had an estimated population of 72,189 in 30,136 households, and a population density of 210 persons per km2. The total area of the city is 354.36 square kilometres (136.82 sq mi). The city's name may also be spelled "Ohtawara" as indicated by the official city website.

Tochigi Prefecture is a landlocked prefecture of Japan located in the Kantō region of Honshu. Tochigi Prefecture has a population of 1,897,649 and has a geographic area of 6,408 km². Tochigi Prefecture borders Fukushima Prefecture to the north, Gunma Prefecture to the west, Saitama Prefecture to the south, and Ibaraki Prefecture to the southeast.