Festival dijadwalkan dari 23 Jul hingga 26 Jul 2015 (3 hari).
Tomorrowland berlangsung di Boom, Belgium. Berikut adalah alamat lengkap festival: Tomorrowland 2850 Boom, Belgium
Armin van Buuren, Paul Kalkbrenner, David Guetta, Tiësto, The Chainsmokers, Martin Garrix, Lost Frequencies, Steve Aoki, Robin Schulz, Alesso, Dimitri Vegas & Like Mike, Bob Sinclar, Afrojack, Cosmic Gate, Yellow Claw, Astrix, Carl Cox, Don Diablo, Stephan Bodzin, Richie Hawtin, Maceo Plex, Bakermat, R3hab, Markus Schulz, Nicky Romero, Andrew Rayel, Ferry Corsten, W&W, BlasterJaxx, San Holo.
Genre dan sub-genre yang paling populer dari edisi sebelumnya adalah:
electronic
pop
rock
house
dance
electronica
techno
trance
electro
electro house
progressive house
minimal
club
tech house
minimal techno
progressive trance
deep house
edm
hardstyle