The World Chess Championship is played to determine the World Champion in the board game chess. Both men and women are eligible to contest this title.

The official world championship is generally regarded to have begun in 1886, when the two leading players in the world played a match. From 1886 to 1946, the championship was conducted on an informal basis, with a challenger having to defeat the incumbent in a match to become the new world champion. From 1948 to 1993, the championship was administered by FIDE, the international chess organization. In 1993, the reigning champion (Garry Kasparov) broke away from FIDE, meaning there were two rival championships. This situation remained until 2006, when the title was unified at the World Chess Championship 2006. The most recent championship was the World Chess Championship 2007, won by Viswanathan Anand.

In addition, there is a separate event for women only, for the title of Women's World Champion, and separate competitions and titles for juniors, seniors and computers. However, these days the strongest competitors in the junior, senior, and women's categories often forego these niche title events in order to pursue top level competition, although they continue to be part of chess tradition. Computers are barred from competing for the open title.