Tachikawa is a city located in the western portion of Tokyo Prefecture, Japan. As of 1 March 2021, the city had an estimated population of 184,383 in 93,428 households, and a population density of 7600 persons per km2. The total area of the city is 24.36 square kilometres (9.41 sq mi).

Tachikawa Airfield is an airfield in the city of Tachikawa, in the western part of Tokyo, Japan. Currently under the administration of the Ministry of Defense, it has also served as a civilian airport with Japan's first scheduled air service.