The 2015 League of Legends World Championship was an esports tournament for the multiplayer online battle arena video game League of Legends. It was the fifth iteration of the League of Legends World Championship, an annual international tournament organized by the game's developer, Riot Games. It was held from October 1 to 31 in various cities across Europe: the group stages in Le Dock Pullman, in Paris, France; the quarterfinals at the Wembley Arena in London, England, United Kingdom; the semifinals in the Brussels Expo in Brussels, Belgium; and the finals at Mercedes-Benz Arena in Berlin, Germany. The 16 teams qualified by either winning a professional league or a regional qualifying tournament. There was a 16 team round-robin group stage followed by an 8 team single elimination bracket. The games were officially streamed on Twitch, YouTube and Azubu in several languages. The BBC also streamed the tournament online on BBC Three but for British IP addresses only. A peak of around 14 million concurrent viewers watched the finals, according to official sources.

The Uber Arena, previously known under several other names, is a multipurpose indoor arena in the Friedrichshain neighborhood of Berlin, Germany, which opened in 2008. The arena became known as Uber Arena following a long-term deal with venue operators AEG Europe in 2024.