The Nishiseto Expressway (西瀬戸自動車道, Nishiseto Jidōsha-dō), often called the Shimanami Kaidō (しまなみ海道), is an expressway in Japan that connects Onomichi, Hiroshima and Imabari, Ehime, going through nine of the Geiyo Islands, including Ōshima, Ōmishima, and Innoshima.

The route is famed for its scenic views and can be crossed by bicycles, mopeds and pedestrians as well as cars.

It was opened on May 1, 1999, and is 59.4 kilometres (36.9 miles) long, sporting four lanes with a separated path for pedestrians and cyclists.

Although there are two other land connections between Shikoku and Honshu as well, Nishiseto Expressway is the only one that can be traversed on foot or by bicycle.

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