List of best-selling singles in the United Kingdom

For the purposes of calculating sales, a single is currently defined by the Official Charts Company (OCC) as either a 'single bundle' having no more than four tracks and not lasting longer than 25 minutes or one digital audio track not longer than 15 minutes with a minimum sale price of 40 pence.

The best-selling single in the UK is "Something About the Way You Look Tonight"/"Candle in the Wind 1997", a double A-side released by Elton John following the death of Diana, Princess of Wales.

[3][4] The highest-selling single by a solo female artist is "All I Want For Christmas Is You" by Mariah Carey – released in October 1994, it has combined sales of over 4 million in the UK.

[6] When streaming is taken into account, "All of Me" by John Legend, which has over 2.1 million combined sales, is the highest-selling single not to have topped the charts.

[5] The highest-selling single (paid-for purchases) in the 21st century is "Happy" by Pharrell Williams, which has sold 1.93 million;[7] it overtook "Anything Is Possible" / "Evergreen" by Will Young in 2015.