Hiroshima Castle , sometimes called Carp Castle , is a castle in Hiroshima, Japan that was the residence of the daimyō of the Hiroshima Domain. The castle was originally constructed in the 1590s, but was largely destroyed by the atomic bombing on August 6, 1945. The main keep was rebuilt in 1958, a replica of the original that now serves as a museum of Hiroshima's history before World War II, and other castle buildings have been reconstructed since.

Japanese castles are fortresses constructed primarily of wood and stone. They evolved from the wooden stockades of earlier centuries and came into their best-known form in the 16th century. Castles in Japan were built to guard important or strategic sites, such as ports, river crossings, or crossroads, and almost always incorporated the landscape into their defenses.