The 2018 EU League Championship Series is the fifth season of Europe's professional League of Legends league. The tournament will start with the EU LCS spring promotion tournament which is composed of four teams, out of which is 2 lowest ranked team from the LCS summer season and winners from the EUCS Summer playoffs. The 2 winners of from the EU LCS Spring Promotion will be seeded to the EU LCS Spring Season Tournament.

The winner of the spring split will be invited to the 2018 Mid Season Invitational that will be held inbetween the Spring and Summer split of 2018.

As per this season there has been changes to both Promotion/Relegation and Format. The regular season format will follow the changes made in the NA LCS with going back to best-of-ones.

As for the EU LCS promotion, Riot Games have decided to remove the Promotions/Relegation after the Spring season, giving the teams participating more time to cultivate talent