Group A of the 1986 FIFA World Cup was one of six groups of national teams competing at the 1986 FIFA World Cup.
Most matches were played at the Estadio Olímpico Universitario in Mexico City or at the Estadio Cuauhtémoc in Puebla.
Eventual champions Argentina topped the group, joined in the second round by 1982 champions Italy as well as Bulgaria.
South Korea were making their first appearance in the tournament since 1954.
Assistant referees: Chris Bambridge (Australia) Siegfried Kirschen (East Germany) Assistant referees: Jesús Díaz (Colombia) Gabriel González (Paraguay) Assistant referees: Alan Snoddy (Northern Ireland) Antonio Marquez Ramirez (Mexico) Assistant referees: Valeri Butenko (Soviet Union) Ioan Igna (Romania)