Hiroshima Domain (広島藩, Hiroshima-han) was a han, or feudal domain, of Edo period Japan. Based at Hiroshima castle in the city of Hiroshima, the domain encompassed Aki province and parts of neighboring Bingo province.
Following the battle of Sekigahara in 1600, the han was established with Fukushima Masanori as its daimyō (feudal lord). However, nineteen years later, Hiroshima castle suffered extensive flood damage and Fukushima repaired it in violation of the Tokugawa shogunate's laws on the construction and repair of castles (see buke shohatto). The shogunate then ordered Fukushima to Kawanakajima Domain, and awarded Hiroshima to the Asano clan, who ruled it for the remainder of the Edo period, during which it was the sixth-largest domain in Japan, excepting those held by the Tokugawa-Matsudaira dynasty. The domain was dismantled along with all the others in 1871.
Daimyō of Hiroshima
- Mōri Terumoto (1591–1600)*; 1,120,000 koku
- Fukushima Masanori (1600–1619); 498,223 koku
Asano clan:
- Asano Nagaakira (1619–1632); 426,500 koku**
- Asano Mitsuakira (1632–1672)
- Asano Tsunaakira (1672–1673)
- Asano Tsunanaga (1673–1708)
- Asano Yoshinaga (1708–1752)
- Asano Munetsune (1752–1763)
- Asano Shigeakira (1763–1799)
- Asano Narikata (1799–1830)
- Asano Naritaka (1831–1858)
- Asano Yoshiteru (1858–1858)
- Asano Nagamichi (1858–1869)
- Asano Nagakoto (1869–1871)
*The years listed are those in which the lord occupied Hiroshima castle, not the years of his life. **All of the lords after Asano Nagaakira enjoyed the same 426,500 koku.