Kvassay Bridge, Road bridge in Budapest District IX, Hungary.

Kvassay Bridge is a road bridge over the Ráckeve-Soroksár Danube branch at the northern tip of Csepel Island, linking it with Budapest District IX. The current structure, opened on 26 June 2000, is a continuous box-girder bridge with an orthotropic steel deck, two 8.0 m carriageways and 2.2 m walkways, 97.04 m long. Its two spans match the 47.2 m openings of the 1927 truss bridge it replaced.

The bridge was completed in 1927 and named after engineer Jenő Kvassay, a figure who contributed to Budapest's infrastructure development. It was built during a period when the city was expanding its southern transportation connections.

The bridge is named after Jenő Kvassay, a hydraulic engineer. Its 1927 steel structure was made by MÁVAG, the Hungarian Royal State Iron, Steel and Machine Works, which also designed it. The bridge carried buses from October 1928 until the Csepel rapid transit line opened.

The road bridge carries two lanes plus a 2.2 m walkway on each side of the 97.04 m steel structure, rebuilt in 1999–2000. The parallel H7 HÉV rail bridge, renewed from 2020, stands just west of it; trains cross at up to 60 km/h. The 2006 Kvassay áttörés links the Csepel road with Könyves Kálmán körút.

The bridge crosses a special location where the Danube branch allows railway and road traffic to pass above and below one another, creating an unusual layered transportation arrangement in the city. This spatial solution was noteworthy for urban mobility planning at the time.