The League of Legends European Championship (LEC), previously known as the European League of Legends Championship Series (EU LCS), is the name of the professional League of Legends esports league run by Riot Games, in which ten teams compete. Each annual season of play is divided into two splits, spring and summer, both consisting of nine weeks of round-robin tournament play, which then conclude with play-off tournaments between the top six teams.

At the end of the season, the winner of the summer split, the team with the most championship points, and the winner of the gauntlet tournament qualify for the annual League of Legends World Championship. The LEC represents the highest level of League of Legends play in Europe. With the exception of some touring events, all games of the LEC are played live at Riot Games' studio in Adlershof, Berlin, Germany.