Itabashi (板橋区, Itabashi-ku; Japanese pronunciation: [i.taꜜ.ba.ɕi, -ta.ba.ɕi̥ꜜ.kɯ, -baꜜ.ɕi̥.kɯ]) is a special ward in the Tokyo Metropolis in Japan. In English, it is called Itabashi City. Itabashi has sister-city relations with Burlington, Ontario, in Canada; Shijingshan District of Beijing in the People's Republic of China; and Bologna in Italy.

As of May 1, 2015, the ward has an estimated population of 547,270, and a population density of 16,990 persons per km². The total area is 32.22 km².

Itabashi lies on the Kantō plain. The Arakawa River, a major river, forms part of the boundary with Saitama Prefecture. Surrounding the ward are, in Saitama, the cities of Wakō and Toda; and in Tokyo, the wards of Nerima, Toshima, and Kita.

Notes:

^a – (2, 3, 4, 5, 6, 7, 8)
^b – (formerly part of Shimura Nishidai area)
^c – (1 & 9)

The name of the ward means "plank bridge" and derives from the wooden span over the Shakujii River that dates from the Heian period. Such a bridge was remarkable at the time, and the name has lasted since. The current bridge in that location is made of ferroconcrete. In the Edo period, the Nakasendō crossed the nearby Shimo Itabashi, and the name came to apply to that area as well. Itabashi was one of the Four Edo Post Towns, and travellers first lodged there after leaving the shogunal capital. Kaga Domain had a mansion there. The shogunate maintained the Itabashi execution grounds at Itabashi.

On October 1, 1932, nine towns and villages of Kita-Toshima District were merged and became part of Tokyo City as Itabashi Ward. It became a special ward May 3, 1947. On August 1 of that year, the localities of Nerima, Kami-Nerima, Naka-Arai, Shakujii and Ōizumi were split off from Itabashi to create Nerima Ward.

Per Japanese census data, the population growth has remained stable since 1970.