Festivalen ble arrangert fra 23 Jul til 26 Jul 2015 (3 dag(er)).
Tomorrowland finner sted i Boom, Belgium. Her er den fullstendige adressen til festivalen: 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.
De mest populære sjangrene og undersjangrene i den siste utgaven var:
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