Kōtō is a special ward in the Tokyo Metropolis in Japan. The ward refers to itself as Kōtō City in English. As of May 1, 2015, the ward has an estimated population of 488,632, and a population density of 12,170 persons per km2. The total area is approximately 40.16 km2.

Special wards are a special form of municipalities in Japan under the 1947 Local Autonomy Law. They are city-level wards: primary subdivisions of a prefecture with municipal autonomy largely comparable to other forms of municipalities.