Festival dijadwalkan dari 27 Jul hingga 29 Jul 2012 (2 hari).
Tomorrowland berlangsung di Boom, Belgium. Berikut adalah alamat lengkap festival: Tomorrowland 2850 Boom, Belgium
tINI, David Guetta, Above & Beyond, Angerfist, Calvin Harris, Fatboy Slim, Steve Aoki, Alesso, Swedish House Mafia, Skrillex, Zedd, Porter Robinson, Dimitri Vegas & Like Mike, Afrojack, Carl Cox, Richie Hawtin, Maceo Plex, Zeds Dead, Gareth Emery, Paul van Dyk, R3hab, Nicky Romero, Ferry Corsten, W&W, Da Tweekaz, Marco Carola, Avicii, Sven Väth, Hardwell, Pendulum.
Genre dan sub-genre yang paling populer dari edisi sebelumnya adalah:
electronic
pop
rock
house
electronica
techno
dance
electro
trance
electro house
minimal
minimal techno
progressive house
tech house
club
deep house
dubstep
progressive trance
progressive