Feeder will play Reading on Saturday (August 25) and Leeds on Sunday (August 26), along with Young Guns, Citizens and We Are The In Crowd.
The View, The Futureheads, 2:54, SCUM and Toy will all play Reading on the Sunday (August 26) and Leeds on Friday (August 24).
Meanwhile, Sleigh Bells will headline the Festival Republic Stage on Friday in Reading and Saturday in Leeds and will be preceded by Niki & The Dove, The Subways, Veronica Falls, Bastille, Alt J and We Are Augustines.
Reading and Leeds Festival 2012 will be headlined by The Cure, Foo Fighters and Kasabian.
Paramore, The Vaccines, At The Drive-In, You Me At Six and Bombay Bicycle Club have all been confirmed to play sets.
Watch the music video for Feeder's recent single 'Borders' below: