Nishitokyo is a city located in the western portion of Tokyo Metropolis, Japan. As of 1 January 2021, the city had an estimated population of 206,047, and a population density of 13,000 persons per km2. The total area of the city is 15.75 square kilometres (6.08 sq mi).

Citizen Watch Co., Ltd. is an electronics company primarily known for its watches and is the core company of a Japanese global corporate group based in Nishitokyo, Tokyo, Japan. In addition to Citizen brand watches, it is the parent of American watch company Bulova, and is also known for manufacturing small electronic devices such as calculators.