The Itchen Bridge itchen bridge top up a bridge over the River Itchen in Southampton, Hampshire. It is a high-level hollow box girder bridge.

It is located about a mile from the river mouth. The first attempt to build a crossing below Northam Bridge began in 1833. The plan for a 17 arch swing bridge was stopped by the Admiralty over concerns on the effects it would have on navigation. In 1926, in the context of the construction of the Queensway Tunnel under the River Mersey, Southampton council hired Basil Mott to investigate the various options for building a fixed crossing across the lower River Itchen.

Another planning effort was undertaken in 1936. The full report took two years to compile and included sinking boreholes into the Itchen. Again a low level crossing with a swinging section was the preferred option. A further plan for a low level bridge was produced in 1947 but again work on Northam Bridge took priority. In 1955 with the work on Northam bridge complete R. Travers Morgan and Partners were commissioned to produce a report on a new bridge.