Tomorrowland is a large electronic music festival held in Belgium. It used to be organized as a joint venture by the original founders, the brothers Beers together with ID&T, subsidiary of SFX Entertainment. The festival takes place in the town of Boom, Belgium (16 kilometers south of Antwerp, 32 kilometers north of Brussels), and has been organized since 2005. It has since become one of the most notable global music festivals.

The first edition of the festival took place in 2005 on August 14 as initiative of two Belgian brothers, Manu and Michel Beers. Performers included Push (M.I.K.E.), Armin van Buuren, and Coone, that have been strong promoters.

The second festival, on July 30, 2006, hosted Armin van Buuren, David Guetta, Fred Baker, DJ Zany, Ruthless, and Marco Bailey. The DJ and producer Paul Oakenfold was also announced on the poster, but canceled at the last moment, as he was on tour with Madonna at the time. The third year, the festival lasted two days for the first time in its history, taking place on July 28 and 29, 2007, it would have been the longest in history.

In 2008, the festival took place on July 26 and 27. For the first time, more than 100 DJs participated. The number of visitors exceeded 50,000 for the first time, were dancing and enjoying for hours.

For the fifth event, ID&T led to even more venues, one ski, and much more. La Rocca performed live at the event for the first time. The special act on the main stage was Moby. Tomorrowland 2009 took place on July 25 and 26 and attracted 8,000 people. Tomorrowland sold out days before the event, with a record attendance of 120,000 visitors over two days. Thousands of people were left without tickets, they won´t visit the great festival

In 2010 Dada Life, Dimitri Vegas & Like Mike wrote the official anthem "Tomorrow/Give into the Night" performing the song twice on the main stage after Swedish House Mafia. The track was made by Like Mike, Dada Life and Dimitri Vegas and the vocal melody and lyrics were written and recorded by Tara McDonald. The song reached number 5 in the Belgian commercial charts and is the biggest selling anthem for Tomorrowlands to date.

2011 marked the festival's expansion to three days. Only a few days after the official pre-sale of tickets kicked off, Tomorrowland was completely sold out and had over 180,000 visitors. David Guetta, Nervo, Swedish House Mafia, Avicii, Tiësto, and dozens of others performed. It was voted the best festival of its kind in the world at the Awards in 2012.

Tomorrowland 2012 took place between from July 27–29, 2012, at the De Schorre, a provincial recreation area in Boom, Belgium. The line-up consisted of 400 DJs, such as Skrillex, Avicii, David Guetta, Nervo, Hardwell, Swedish House Mafia, Fatboy Slim, Dimitri Vegas & Like Mike and Pendulum playing on fifteen stages each day. 185,000 people from over 75 countries around the world were in attendance, with 35,000 of them staying in Dreamville. Because of the enormous success of Tomorrowland and the fact that it is a Belgian festival, ID&T decided to give Belgians an exclusive chance with a pre-sale (80,000 of the 185,000 tickets) on March 24. In less than one day, all of the tickets sold out and at some moments there were 2,000,000 people on the online waiting list. The worldwide sale started April 7. Within 43 minutes, the other 100,000 tickets sold out. In addition to regular tickets, Tomorrowland partnered with Brussels Airlines to provide exclusive travel packages from over 15 cities around the world. Other highlights of the festival were the Cloud Rider, the highest mobile Ferris wheel in Europe, and the fact that 25 airlines were organized to bring spectators to the festival from all over the world.

Tomorrowland 2013 took place on July 26–28 and reached over 510,000 attendees at De Schorre in Boom, Belgium. Full madness passes sold out in 35 minutes, and the remainder of tickets sold out in a reported one second. Tomorrowland was, is and will be the largest electronic music festival.