List of UK Jazz & Blues Albums Chart number ones of 2021

The UK Jazz & Blues Albums Chart is a record chart which ranks the best-selling jazz and blues albums in the United Kingdom. Compiled and published by the Official Charts Company, the data is based on each album's weekly physical sales, digital downloads and streams. In 2021, 53 charts were published with 30 albums at number one. The first number-one album of the year was The Best of Peter Green's Fleetwood Mac by Fleetwood Mac, which spent the first two weeks of the year atop the chart. The last number-one album of the year was Still Rising: The Collection, the first greatest hits album by Gregory Porter, for the last eight weeks of 2021.

The most successful album on the UK Jazz & Blues Albums Chart in 2021 was Porter's Still Rising: The Collection, which spent eight straight weeks atop the chart. The second most successful albums were The Ultimate Collection, a greatest hits album by Ella Fitzgerald, and Delta Kream, the tenth studio album by The Black Keys, both of which spent five weeks at number one over multiple spells. Emma-Jean Thackray spent four weeks atop the UK Jazz & Blues Albums Chart with her first full-length studio album Yellow, while Tony Bennett and Lady Gaga spent three weeks at number one with their second collaborative release, Love for Sale.