List of UK Jazz & Blues Albums Chart number ones of 2005

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 2005, 52 charts were published with nine albums at number one. Jamie Cullum's third studio album Twentysomething was the first number-one album of the year, spending the first three weeks atop the chart. Michael Bublé's fourth studio album It's Time was the final number-one album of the year, topping the chart for eight weeks starting in November (it remained number one for the first five weeks of 2006).

The most successful album on the UK Jazz & Blues Albums Chart in 2005 was It's Time, which spent a total of 26 weeks at number one over three spells of 15 weeks, three weeks and eight weeks. Madeleine Peyroux's third studio album Careless Love spent a total of nine consecutive weeks at number one, from 31 July to 8 October 2005. Jamie Cullum also spent nine weeks atop the chart during 2005 – five with Twentysomething and four with follow-up Catching Tales. Rory Gallagher's Big Guns: The Very Best of Rory Gallagher was also number one for four weeks. It's Time finished 2005 as the 42nd best-selling album of the year in the UK.