The singer's second album 21 sold more than 14.5 million copies last year, putting her considerably ahead of her closest rival Coldplay.
The band's fifth studio set Mylo Xyloto shifted 3.2m copies, while Adele's debut album 19 came in third place with sales of 2.3m.
Mumford & Sons' debut LP Sigh No More lands at four with sales of 1.4m, despite being released back in 2009, reports Music Week.
Amy Winehouse's posthumous collection Lioness: Hidden Treasures is at five, after selling well in the UK, US, Canada and Australia.
Having topped the list in 2009 and 2010, Susan Boyle ranks at number six in 2011 with her latest album Someone To Watch Over Me.
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The top albums by UK artists worldwide in 2011 are as follows:
1. Adele: 21
2. Coldplay: Mylo Xyloto
3. Adele: 19
4. Mumford & Sons: Sigh No More
5. Amy Winehouse: Lioness: Hidden Treasures
6. Susan Boyle: Someone To Watch Over Me
7. Jessie J: Who You Are
8. Amy Winehouse: Back To Black
9. Florence + the Machine: Ceremonials
10. Florence + the Machine: Lungs
Watch Adele perform 'Rumour Has It' at the iTunes Festival 2011 below: