User:03md/List of UK top 40 singles in 2021

See also: Lists of UK top 10 singles and Lists of UK top 40 singles

The UK Singles Chart is one of many music charts compiled by the Official Charts Company that calculates the best-selling singles of the week in the United Kingdom. Since 2004 the chart has been based on the sales of both physical singles and digital downloads, with airplay figures excluded from the official chart. Since 2014, the singles chart has been based on both sales and streaming; in 2021 it uses the ratio of 150 streams equivalent to one sale (not 100:1 as previously).

Chart rules were altered again from 7 July 2018 to help new artists break through by limiting the number of tracks by the same artist allowed in the chart at the same time to 3. The streaming to sales ratio remained largely unchanged but for songs which have spent a high number of weeks in the chart the ratio is altered to 300:1. This list shows singles that peaked in the Top 40 of the UK Singles Chart during 2021, as well as songs which peaked in 2020 or 2022 but were in the top 40 in 2021. The entry date is when the song appeared in the top 40 for the first time (week ending, as published by the Official Charts Company, which is six days after the chart is announced).

singles have been in the top forty this year. Sixty-one singles from 2020 remained in the top 40 for several weeks at the beginning of the year, or re-entered during the year. all first charted in 2020 but reached their peak in 2021.

Eighty-one artists had multiple entries in the top forty in 2021 with Justin Bieber having the most entries (11). Singles that reached the top ten this year are featured here but also included in their own article.

Top-forty singles

 * Key

Entries by artist
The following table shows artists who achieved two or more top 40 entries in 2021, including songs that reached their peak in 2020 or 2022. The figures include both main artists and featured artists. Appearances on ensemble charity records are also counted for each artist.