Chvrches and Limp Bizkit are among the new names for Electric Castle.
Giggs, Sigma, Gang of Youths, Zomboy, Nightmares On Wax, Zeds Dead, Dub Pistols, Bondax and The Black Madonna have also joined the bill, which will be headlined by Florence + The Machine.
There will also be sets from Thirty Seconds To Mars, Bring Me The Horizon, Metric, The Vaccines, While She Sleeps, and more.
Electric Castle takes place from 17th-21st July at Banffy Castle Cluj, Romania.