| Mukaishima Island | |
| Map: | Japan |
| Native Name: | 向島 Mukaishima |
| Native Name Link: | Japanese language |
| Location: | Seto Inland Sea |
| Coordinates: | 34.3861°N 133.2009°W |
| Area Km2: | 23.31 |
| Length Km: | 7 |
| Width Km: | 5 |
| Highest Mount: | Takamiyama |
| Elevation M: | 283.2 |
| Country: | Japan |
| Country Admin Divisions Title: | Prefecture |
| Country Admin Divisions: | Hiroshima |
| Country Admin Divisions Title 1: | city |
| Country Admin Divisions 1: | Onomichi |
| Population: | 25816 |
| Population As Of: | 1968-2003 |
| Density Km2: | 1108 |
| Ethnic Groups: | Japanese |
is the northernmost island in the Geiyo Islands chain accommodating Nishiseto Expressway connecting Honshu and Shikoku islands. Its coasts are washed by Seto Inland Sea. The island's highest peak is 283.2m (929.1feet) high.
The Mukaishima is a pear-shaped island and separated from the Honshu mainland by a 200-meter wide strait.
The Mukaishima is connected to the mainland of Honshu and Innoshima islands by bridges of Nishiseto Expressway (Shimanami Kaidō). Bridge connection also exists to, and ferry is available to Fukuyama with a stopover at . The island is served by the national Route 317. The buses to Mukaishima can be taken from Hiroshima, Fukuyama or Onomichi cities.[2]
The Mukaishima Island is an important shipbuilding center, with several shipyards on the north of the island producing coastal vessels.[3] Also, Mukaishima Dockyard is the leading ship repair center in Japan, serving about 300 ships annually.