Hiroshima (広島市 Hiroshima-shi) is the capital of Hiroshima Prefecture, and the largest city in the Chūgoku region of western Honshu, the largest island of Japan. The city's name, 広島, means "Wide Island" in Japanese. Hiroshima gained city status on April 1, 1889. On April 1, 1980, Hiroshima became a designated city. As of 2006, the city had an estimated population of 1,154,391. Kazumi Matsui has been the city's mayor since April 2011.

Hiroshima is best known as the first city in history to be targeted by a nuclear weapon when the United States Army Air Forces (USAAF) dropped an atomic bomb on the city at 8:15 a.m. on August 6, 1945, near the end of World War II.

During World War II, the 2nd General Army and Chugoku Regional Army were headquartered in Hiroshima, and the Army Marine Headquarters was located at Ujina port. The city also had large depots of military supplies, and was a key center for shipping.

The bombing of Tokyo and other cities in Japan during World War II caused widespread destruction and hundreds of thousands of deaths. For example, Toyama, an urban area of 128,000 people, was nearly destroyed, and incendiary attacks on Tokyo claimed the lives of 100,000 people. There were no such air raids on Hiroshima. However, a real threat existed and was recognized. In order to protect against potential firebombings in Hiroshima, school children aged 11–14 years were mobilized to demolish houses and create firebreaks.

On Monday, August 6, 1945, at 8:15 a.m., the nuclear bomb "Little Boy" was dropped on Hiroshima by an American B-29 bomber, the Enola Gay, flown by Colonel Paul Tibbets, directly killing an estimated 80,000 people. By the end of the year, injury and radiation brought the total number of deaths to 90,000–166,000. The population before the bombing was around 340,000 to 350,000. Approximately 70% of the city's buildings were destroyed, and another 7% severely damaged.

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