Shōnan Ōhashi, Transportation bridge in Hiratsuka, Japan.

Shōnan Ōhashi is a 698 m road bridge on National Route 134 over the Sagami River in Hiratsuka, Kanagawa Prefecture, the closest bridge to the river mouth. The current structure is the second bridge on the site, with separate downstream and upstream spans; the Hiratsuka end stands 12.8 m above sea level.

Construction began in August 1934 and the bridge opened on 23 October 1936 as part of the Shōnan Road (Kanagawa Prefectural Route Katase-Ōiso line); its 661 m span was then the longest in the prefecture. It became a National Route 134 bridge in 1965. The aging structure was replaced in 1986 by the current downstream carriageway, and an upstream carriageway opened on 28 March 2010, giving four lanes.

The bridge's name was adopted commercially: in April 2010 the company Trusco Nakayama bought naming rights, making it "Trusco Shōnan Ōhashi" — the first naming-rights deal for a bridge in Japan. In March 1991 it was chosen for Kanagawa's list of 100 notable bridges.

The bridge carries National Route 134 across the Sagami River at its mouth, with a 698 m span and a deck height of 12.8 m on the Hiratsuka side. The current structure is the second bridge, rebuilt in 1986 and widened to four lanes in 2010. It is part of the Kanagawa Bridge 100 selection.

The bridge carries National Route 134 and stands closest to the mouth of the Sagami River among all bridges crossing it. In 2010 it became the first bridge in Japan to sell its naming rights, and the nickname Trusco Shōnan Ōhashi was adopted on 1 April 2010.