Westminster Bridge is a bridge over the River Thames between Westminster and Lambeth. The current bridge is the second on the site, and was opened in 1862, replacing an earlier bridge that had opened in 1750 and had the tendency to sway alarmingly. Westminster Bridge is a seven-arch wrought iron bridge and has gothic detailing by Charles Barry, who was the architect of the Palace of Westminster.

It links the Palace of Westminster on the west side of the river with County Hall and the London Eye on the east. The next bridge downstream is Hungerford footbridge and upstream is Lambeth Bridge.