Chūō is a special ward located within the Tokyo Metropolis in Japan, serving as one of the city's core administrative divisions. Situated in the central area of Tokyo, it is surrounded by five other special wards: Chiyoda, Minato, Taitō, Sumida, and Kōtō. The ward refers to itself in English as Chūō City and functions as a vital hub for commerce and administration. Its name literally translates to "Central Ward," reflecting its historical role as Tokyo’s main commercial center before the rise of western districts like Shinjuku and Shibuya.

The ward was established on March 15, 1947, under the new Local Autonomy Law through the merger of the former Nihonbashi and Kyōbashi wards. This formation followed Tokyo City's transformation into the Tokyo Metropolis. Historically, the area served as the core of Shitamachi, the original downtown center of Edo-Tokyo. During the Edo period, it was known as Edomachi, the town center of Edo, where Shōgun Tokugawa Ieyasu began developing a commercial district in 1612. The area's layout was significantly influenced by fires and subsequent replanning efforts in 1657 and 1872.

Chūō is divided into three primary zones: Nihonbashi, Kyōbashi, and Tsukishima. The Nihonbashi and Kyōbashi areas are predominantly commercial, located on the east side of Tokyo Station, and incorporate famous districts such as Ginza and Tsukiji. Ginza is renowned as Tokyo's most expensive shopping district, featuring large department stores and the Kabuki-za theater. Tsukishima is a separate island in Tokyo Bay dominated by condominium towers, while the former waterways that once crisscrossed the area now form the basis for many neighborhood divisions.

The ward offers significant cultural appeal through its historic sites and culinary traditions. Tsukiji is widely viewed as one of the best sushi destinations globally due to its wholesale fish market, which supplies restaurants across eastern Japan. Other notable landmarks include the Hama-rikyū Gardens, a spacious public park formerly owned by daimyō, and the Suitengu Shrine, where women pray for safe birth. The area also hosts the Tokyo Stock Exchange in Kabutocho and the Bank of Japan in Hongokucho, maintaining its status as a financial and business epicenter.

As of 2021, the ward has a resident population of 169,995, with a total area of approximately 10.21 km². Due to the concentration of businesses and retail space, the daytime population swells to an estimated 650,000. The economy is robust, hosting headquarters for major companies such as Ricoh, Sumitomo Corporation, Daiichi Sankyo, and IBM Japan. The ward is physically the second-smallest in Tokyo, with only Taitō being smaller, and is located entirely outside the Yamanote Line loop, which defines the inner core of central Tokyo.