Hakata-Ōshima Bridge, Suspension bridge in Imabari, Japan

Hakata-Ōshima Bridge is the combined name for the Hakata Bridge and Ōshima Bridge, a single structure crossing the Miyakubo Strait between Hakatajima and Ōshima in Imabari, Ehime. The 1,230-meter crossing spans the small island of Mikikushima: the Hakata Bridge is a three-span continuous steel box-girder bridge, while the Ōshima Bridge is a single-span two-hinge stiffened box-girder suspension bridge with a 560-meter main span. It carries two provisional lanes of the Nishiseto Expressway and has a separate path for pedestrians, bicycles and mopeds.

The crossing opened on 17 January 1988 as part of the Nishiseto Expressway, the 59 km route linking Honshū with Shikoku across seven small islands. It combines two structures over the Miyakubo Strait: the Hakata Bridge, a three-span continuous steel box-girder bridge from Hakatajima to the islet of Mikikaijima, and the Ōshima Bridge, a single-span two-hinge stiffened box-girder suspension bridge with a 560 m main span from Mikikaijima to Ōshima.

The crossing is formed of two joined structures: the Hakata Bridge, a three-span continuous steel box-girder bridge over the Hakatajima–Mikachijima stretch, and the Ōshima Bridge, a single-span two-hinge stiffened box-girder suspension bridge with a 560 m main span. Mikachijima, the islet between them, has exits only for pedestrians, cyclists and mopeds, not cars.

The crossing carries a walkway and cycle path alongside the road, with a dedicated entrance on Mikikaijima island that has no car access. Pedestrians cross free of charge. Walkers and two-wheelers are barred when wind reaches 15 m/s, and the road closes at 25 m/s.

The bridge features a main span of 560 meters and stands as one of several major crossings in the chain of bridges connecting Honshū and Shikoku islands.