List of UK Singles Sales Chart number ones

The UK Singles Sales Chart is a weekly record chart compiled by the Official Charts Company (OCC) on behalf of the British record industry. The UK Singles Sales Chart differs from the UK Singles Chart (also known as the Official Singles Chart) in that it counts "physical" sales only (including downloads),[1] whereas the Official Chart also counts streaming.[2] Since 10 July 2015, the chart week has run from Friday to Thursday with the chart-date given as the following Thursday;[3] prior to this, the chart week ran from Sunday to Saturday, with the chart date given as the following Saturday.

It was announced in June 2014 that as of Sunday, 29 June, audio streams from streaming media services would be counted towards the Official Singles Chart to better reflect changes in music consumption in the United Kingdom after a year-on-year doubling from 100 million to 200 million weekly streams from the previous year.[4][5] The UK Singles Sales Chart uses the previous methodology, and as a result did not face the criticism the UK Singles Chart faced in 2016 when there were no new entries in the top 49[6] and in 2017 when Ed Sheeran's ÷ occupied sixteen of the top twenty places in the chart.[7]