Tokyo City was a municipality in Japan and capital of Tokyo Prefecture which existed from 1 May 1889 until its merger with its prefecture on 1 July 1943. The historical boundaries of Tokyo City are now occupied by the special wards of Tokyo. The newly-merged government became what is now Tokyo, also known as the Tokyo Metropolis or, ambiguously, Tokyo Prefecture.

Tokyo, officially the Tokyo Metropolis, is the capital city of Japan and one of the most populous cities in the world, with a population of over 14 million residents as of 2023. The Greater Tokyo Area, which includes Tokyo and parts of six neighbouring prefectures, is the most-populous metropolitan area in the world, with 40.8 million residents as of 2023.