The shortlist was chosen from an entry of over 260 albums by UK and Irish artists, and the winner will be announced live on BBC Two on 8 September.
The prize does not take sales or even live performances into consideration - it is judged solely through consideration of the music on the albums.
The 2009 Albums of the Year are:
Bat for Lashes - 'Two Suns'
Florence & The Machine - 'Lungs'
Friendly Fires - 'Friendly Fires'
Glasvegas - 'Glasvegas'
Kasabian - 'West Ryder Pauper Lunatic Asylum'
La Roux - 'La Roux'
Led Bib - 'Sensible Shoes'
Lisa Hannigan - 'Sea Sew'
Speech Debelle - 'Speech Therapy'
Sweet Billy Pilgrim - 'Twice Born Men'
The Horrors - 'Primary Colours'
The Invisible - 'The Invisible'
The bookies' joint favourites are Florence & The Machine and Kasabian at 5/1.