Mainbrücke Ginsheim-Gustavsburg, Railway arch bridge in Ginsheim-Gustavsburg, Germany

The Mainbrücke Ginsheim-Gustavsburg is a railway viaduct connecting both banks of the Main River, extending across a considerable distance with multiple arches. The structure displays typical features of early industrial engineering with its steel framework and sturdy pillars anchored in the riverbed.

The viaduct was built in the early 20th century as part of a major modernization of the regional railway network. Its completion enabled an important new railway connection across the Main River.

The bridge carries different names: a panel on the southern approach, installed for the Route der Industriekultur Rhein-Main, reads Hochheimer Brücke, while literature prefers Kostheimer Brücke, citing Kostheim's precedence even though the northern abutment stands in Hochheim and the southern end reaches Bischofsheim. A separate road bridge between Mainz-Kostheim and Ginsheim-Gustavsburg also bears the name Kostheimer Brücke.

The viaduct is visible from viewpoints on both sides of the Main and can be observed from nearby paths or bridge approaches. The best viewing conditions are during daylight when the details of the steel structure are clearly visible.

The bridge's abutments carry bundled, tower-like structures in a Romanesque-revival Jugendstil manner, and the railings also show Jugendstil detail. Much of this original 1902–1904 design survives, including red sandstone piers. The steel superstructures follow a type developed in 1894 by the Duisburg firm Harkort and built here by MAN Gustavsburg.