This is a list of busiest London Underground stations for the 2021 calendar year. The dataset records patterns of mobility during the second year of the COVID-19 pandemic in the United Kingdom, with significantly reduced levels of mobility when compared with the 2019 data. Extended periods of significantly reduced commuting and other travel caused many major central London stations to drop in the ranking during 2020 and for larger suburban stations to replace them. With pandemic restrictions eliminated during the year, this was reversed during 2021.

The London Underground is a rapid transit system in the United Kingdom that serves London and the neighbouring counties of Essex, Hertfordshire and Buckinghamshire. Its first section opened in 1863. Annualised entry/exit counts were recorded at 270 stations in 2021. In 2021, King's Cross St Pancras was the busiest station on the network, used by over 36.73 million passengers, while Kensington (Olympia) was the least used, with 34,499 passengers. Data for 2021 was published on 17 May 2022 and was revised on 8 July 2022.

This table shows the busiest stations with over 14 million entries and exits in 2021.

+Busiest London Underground stations (entries and exits, in millions) Rank (2021) Station Zone(s) 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 King's Cross St Pancras Victoria Oxford Circus London Bridge Waterloo Stratford Liverpool Street Paddington Canary Wharf Bank and Monument Leicester Square Tottenham Court Road Green Park Euston Bond Street Piccadilly Circus Finsbury Park

See also List of busiest London Underground stations (2025), (2024), (2023), (2022), (2020), & (2019) List of London Underground stations List of busiest railway stations in Great Britain

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