The World Chess Championship 2018 was a match between the reigning world champion since 2013, Magnus Carlsen, and the challenger Fabiano Caruana to determine the World Chess Champion. The 12-game match, organised by FIDE and its commercial partner Agon, was played at The College in Holborn, London, between 9 and 28 November 2018. The games were broadcast on worldchess.com and by NRK.

The classical time-control portion of the match ended with 12 consecutive draws, the only time in the history of the world chess championship that all classical games have been drawn. On 28 November, rapid chess was used as a tie-breaker; Carlsen won three consecutive games to retain his title and became four-time world champion.

Caruana qualified as challenger by winning the 2018 Candidates Tournament. This was an eight-player, double round-robin tournament played in Berlin on 10–28 March 2018.

Players qualified for the Candidates Tournament as follows (age, rating and world ranking are as of March 2018, when the tournament was held):

Note: Numbers in the crosstable in a white background indicate the result playing the respective opponent with the white pieces (black pieces if on a black background).

The Championship match between Magnus Carlsen and Fabiano Caruana was held from 9 to 28 November 2018 in London, United Kingdom, at the Cochrane Theatre of The College in Holborn.

The match was organised in a best-of-12-games format. The time control for the games was 100 minutes for the first 40 moves, an additional 50 minutes added after the 40th move, and then an additional 15 minutes added after the 60th move, plus an additional 30 seconds per move starting from move 1. Players were not permitted to agree to a draw before Black's 30th move.

The tie-breaking method consisted of the following schedule of faster games played on the final day in the following order, as necessary: