The 1986 FIFA World Cup was the 13th FIFA World Cup, a quadrennial football tournament for men's senior national teams. It was played in Mexico from 31 May to 29 June 1986. The tournament was the second to feature a 24-team format. Colombia had been originally chosen to host the competition by FIFA but, largely due to economic reasons, was not able to do so, and resigned in November 1982. Mexico was selected as the new host in May 1983, and became the first country to host the World Cup more than once, after previously hosting the 1970 edition.

The FIFA World Cup, often simply called the World Cup, is an international association football competition among the senior men's national teams of the members of the Fédération Internationale de Football Association (FIFA), the sport's global governing body. The tournament has been held every four years since the inaugural tournament in 1930, with the exception of 1942 and 1946 due to the Second World War. The reigning champions are Argentina, who won their third title at the 2022 tournament.