alt-J will play London's O2 Arena on January 24, 2015.
It will be their largest headline show to date, with tickets on sale at 9am on August 20.
They are about to embark on a sold-out tour in September, which will take them to Manchester, Wolverhampton, Glasgow, Brighton and London's Alexandra Palace.
The Mercury-winning band are touring in support of their upcoming album This Is All Yours, released on September 22.
Continuing to build towards the album release date, the band recently released 'Every Other Freckle'.
Watch the video for 'Left Hand Free' below:
