Nihonbashi is a business district of Chūō, Tokyo, Japan which grew up around the bridge of the same name which has linked two sides of the Nihonbashi River at this site since the 17th century. The first wooden bridge was completed in 1603. The current bridge, designed by Tsumaki Yorinaka and constructed of stone on a steel frame, dates from 1911. The district covers a large area to the north and east of the bridge, reaching Akihabara to the north and the Sumida River to the east. Ōtemachi is to the west and Yaesu and Kyobashi to the south.

Chūō is a special ward in the Tokyo Metropolis in Japan. The ward refers to itself in English as Chūō City. It was formed in 1947 as a merger of Kyobashi and Nihonbashi wards following Tokyo City's transformation into Tokyo Metropolis.