The 2021 London mayoral election took place on May 6, 2021. It was held to elect the Mayor of London and members of the London Assembly. The main candidates included the incumbent mayor, Sadiq Khan from the Labour Party, and Shaun Bailey from the Conservative Party. Sadiq Khan won re-election with a significant majority, receiving 55.2% of the first-choice votes. The election was notable for its use of the supplementary vote system, allowing voters to select a second choice. Voter turnout was approximately 42.6%, reflecting the challenges posed by the ongoing COVID-19 pandemic.