The Thames Gateway Bridge was a proposed crossing over the River Thames in east London, England. It was first mooted in the 1970s but never came to fruition. The concept was re-proposed in 2004, with preliminary planning proceeding until November 2008, when Boris Johnson, the Mayor of London, cancelled the entire £500 million scheme.
In 2009, a new scaled-down project on the same site, the Gallions Reach Crossing, was proposed, joined in 2015 by the Belvedere Crossing, until both proposals were cancelled in 2016. Despite several proposals being put forward, there would be no new road crossing between Tower Bridge and the Dartford Crossing until the Silvertown Tunnel began construction in 2021.