Citizen is a Japanese watch manufacturer and one of the largest watch companies in the world. Most watches have quartz movements or Eco-Drive. In 1989, Citizen introduced the Promaster brand of tool watches.
Citizen is organised in several Corporate divisions. The Citizen Group is called Citizen Holdings.
The subsidiary Miyota is responsible for the production of mechanical movements at Citizen. Citizen, under Citizen Systems Japan Co., also produces business and consumer electronic devices.
In 2019, Citizen introduced Calibre 0100, claimed to be the most accurate watch movement ever produced. Accurate to 1 second per year, this quartz movement uses an "AT Cut" oscillator rather than the more conventional tuning fork shape and operates at much higher frequency.