Ōshima (Ehime)

For the island near Niihama in Ehime Prefecture, see Nii Ōshima.

Ōshima (大島) is an island in the Seto Inland Sea that lies between the larger islands of Honshū and Shikoku in Japan. It is part of Ehime Prefecture and is governed by the city of Imabari.

The island is part of the Shimanami Kaidō, an expressway that runs through a chain of islands between Honshū's Hiroshima Prefecture and Shikoku's Ehime Prefecture. The islands serves as one of the anchor points of two majors bridges along the expressway: The Hakata-Ōshima Bridge and the Kurushima-Kaikyō Bridge.