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| Registered | 6,144,225[1] | ||||||||||||||||||||
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| Turnout | 42.2%  3.1% | ||||||||||||||||||||
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The 2021 London mayoral election was held on 6 May 2021 to elect the mayor of London. It was held simultaneously with elections for the London Assembly, other local elections across England and Wales, and devolved elections in Scotland and Wales. The mayoral and Assembly elections were to be held on the 7th of May 2020, but in March 2020 the government announced the election would be postponed until 2021 due to the COVID-19 pandemic.
Sadiq Khan was re-selected as the Labour candidate in 2018, the Conservative Party selected Shaun Bailey and the Green Party chose Siân Berry. Rory Stewart, a former Conservative MP and minister, ran as an independent before withdrawing due to the delay in the election. Siobhan Benita, who had been the Liberal Democrat candidate, also withdrew after the election delay. She was replaced as the party's candidate by Luisa Porritt. Twenty candidates appeared on the ballot, more than in any previous election for the position.
Sadiq Khan of the Labour Party was re-elected, winning 40% of first preference votes and 55% in a run-off against Bailey.