Itsukushima (厳島) is an island in the western part of the Inland Sea of Japan, located in the northwest of Hiroshima Bay. It is popularly known as Miyajima (宮島), which in Japanese means "Shrine Island". The island is one of Hayashi Gahō's Three Views of Japan specified in 1643. Itsukushima is part of the city of Hatsukaichi in Hiroshima Prefecture. The island was part of the former town of Miyajima before the 2005 merger with Hatsukaichi.

Itsukushima is famous for the Itsukushima Shrine, a UNESCO World Heritage Site. The shrine was considered a sacred site for a long time, it is possible that locals built a simple shrine on the site before the complex was built in 593 AD. In 1168 AD, Taira no Kiyomori, a warrior-courtier, greatly contributed to giving the shrine its current form. In the 16th century, Toyotomi Hideyoshi, a famed Japanese warlord, built a large building, the Senjō-kaku, on a hill above the shrine.

Itsukushima has a number of temples, including Toyokuni Shrine with a five-storied pagoda, and Daiganji Temple - one of the three most famous Benzaiten temples of Japan. The island is also famous for its upper hill side cherry blossoms and maple leaf autumn foliage.

The island of Itsukushima, including the waters around it (part of Seto Inland Sea), lies within Setonaikai National Park. This sea is affected by strong tides. At low tide, the bottom of the sea is exposed past the island's torii. At high tide, the sea covers all the previously exposed seabed mud and fills areas underneath the shrine boardwalk.

Itsukushima is mountainous and sparsely settled. It has an elementary school and a middle school. There are no traffic signals. It is rural and mountainous, only 30.39 square kilometres (11.73 sq mi), and has a population of about 2000. There are no cities, only small towns with simple houses and privately owned shops. The islanders work hard to preserve the forests and respect nature.

Frequent ferry services, operated by JR West (JR Miyajima ferry) and by Miyajima Matsudai Tourist Ship, carry traffic between the island and the mainland at Miyajimaguchi. The trip takes about ten minutes. There is an hourly express passenger ferry to Hiroshima harbour.

Miyajima's maple trees are renowned throughout Japan and blanket the island in crimson in the autumn. Momiji manjū, pastries filled with azuki jam or custard, are popular souvenirs and carry maple-leaf emblems. Many other varieties, such as chocolate and cheese, are available. Because the island is seen as sacred, trees may not be cut for lumber. Sika deer roam freely. Deer are thought of as sacred in the native Shinto religion because they are considered messengers of the gods. They walk the streets of the city, not afraid of the tourists.

The shamoji, a style of wooden paddle used to serve cooked rice without impairing the taste, is said to have been invented by a monk who lived on the island. The shamoji is a popular souvenir, and there are some outsized examples around the shopping district.