Funeral For A Friend are to play the Rip Curl Boardmasters festival in Newquay, co-headlining with Ash.
The bands will perform on August 10. Paolo Nutini will also be playing.
Others appearing include Enter Shikari, Paolo Nutini, Guillemots, Newton Faulkner and Scott Matthews.
The festival is due to take place on August 6-12 in Newquay's Watergate Bay.