The 1978 FIFA World Cup was the 11th edition of the FIFA World Cup, a quadrennial international football world championship tournament among the men's senior national teams. It was held in Argentina between 1 and 25 June.
The Cup was won by the host nation, Argentina, who defeated the Netherlands 3–1 in the final, after extra time. The final was held at River Plate's home stadium, Estadio Monumental, in the Argentine capital of Buenos Aires. This win was the first World Cup title for Argentina, who became the fifth team (after Uruguay, Italy, England, and West Germany) to be both hosts and world champions. Argentina, the Netherlands, and Brazil were the gold, silver, and bronze medalists, respectively. Iran and Tunisia made their first appearances in the tournament. This was also the last World Cup tournament to use the original inclusion of 16 teams. Since the first World Cup in 1930, only 15 teams (plus the host, who automatically qualified) had been allowed to qualify (the reigning title holders also received automatic qualification from 1934 through 2002); but for the next World Cup, in Spain, FIFA expanded that tournament to 24 teams.
This tournament was marred by flagrant controversy, domestic politics, and alleged interference and match-fixing by the Argentine authoritarian military junta government, who were using this tournament as an opportunity for nationalistic propaganda, and for the relatively new military junta to seek legitimacy on the world stage.
The official match ball was the Adidas Tango.