Edashima (江田島), also called Nōmi-jima [ja], Nomijima, Nomi Island, or Edashima-Nōmijima (江田島・能美島) is an island in Hiroshima Bay located in southwestern Hiroshima Prefecture, Japan. The mess with island name originates from the ancient (and possibly legendary) strait at now town Ōgaki-chō Hitonose (大柿町飛渡瀬).

The island is roughly Y-shaped, with the former Nōmi occupying center, the Okimi - north-western branch, Edashima - north-eastern branch, and Ōgaki - the southern branch. The island's highest peak, mount 宇根山 (Uneyama) 542 m (1,778 ft) high, is located on the western edge of Nōmi town.

Since 1973, the island is connected to the Japanese mainland of Honshu by the Hayase Ōhashi [ja] bridge passing through the Kurahashi-jima island. The island is served by the national route 487. Also, ferries are available from the cities of Hiroshima and Kure on Honshu island and Matsuyama on Shikoku island.

The Imperial Japanese Naval Academy was moved to Edashima Island in 1888. While the academy still exists under the name Naval Academy Edashima, modern Edashima focuses on olive cultivation and fish hatcheries in Edashima Bay north of the island.

• Cecil Bullock, Edashima: the Dartmouth of Japan (London, 1942)

• Kure Naval District