The 2017 League of Legends World Championship was an esports tournament for the multiplayer online battle arena video game League of Legends. It was the seventh iteration of the League of Legends World Championship, an annual international tournament organized by the game's developer, Riot Games. It was held from September 23 – November 4, 2017, in cities across China. Twenty four teams qualified for the tournament based on their placement in regional circuits such as those in North America, Europe, South Korea, and China, with twelve of those teams having to reach the group stage via a play-in round.

Esports, short for electronic sports, is a form of competition using video games. Esports often takes the form of organized, multiplayer video game competitions, particularly between professional players, played individually or as teams.