International career
Prior to representing the senior Italian side, Zoff had won a gold medal with the Italy under-23 side at the 1963 Mediterranean Football Games. On 20 April 1968, Zoff made his senior debut for Italy, playing in a 2–0 win against Bulgaria in the quarter finals of the 1968 European Championships, in Naples. Zoff ended up being promoted to starting goalkeeper over his perceived career rival Enrico Albertosi during the tournament, and Italy proceeded to win the European Championship on home soil, with Zoff taking home a winners' medal after only his fourth international appearance, keeping two clean sheets, and winning the award for the best goalkeeper of the tournament. Zoff was left out of the Italian starting eleven in the 1970 World Cup, and was Albertosi's deputy throughout the tournament, as Italy went on to reach the final of the World Cup, and were defeated 4–1 by Brazil. He returned to the starting line-up, however, ahead of Albertosi, in Italy's disappointing 1974 World Cup campaign, in which they were eliminated in the first round.
From 1972 onwards, Zoff became Italy's undisputed number 1, and he participated in the 1978 World Cup with Italy, during which he managed a fourth-place finish, keeping 3 clean-sheets. Italy were eliminated in the semi-final, in a 2–1 loss to the Netherlands. After the match, Zoff was criticised for making a fairly uncommon error, as he was beaten by a strike from distance by Arie Haan. Zoff was also Italy's starting goalkeeper once again at the 1980 European Championships on home soil, however, helping his side to finish the tournament in fourth place once again. During the 1980 European Championship, Zoff kept three clean sheets, only conceding one goal in the bronze medal match, which Italy would lose on penalties; Zoff was elected as the goalkeeper of the tournament once again, an honour he had previously managed after winning the tournament in 1968. Throughout these two tournaments, Zoff established a record for most consecutive minutes unbeaten in a European Championship, which was later beaten by Iker Casillas in 2012. Zoff had also established the record for most minutes unbeaten European Championship qualifying, which was also beaten, by compatriot Buffon in 2011. He still holds the record, however, for most consecutive minutes without conceding a goal at the European Championships including qualifying, having kept eight consecutive cleans sheets between 1975 and 1980, while going unbeaten for 784 minutes. Alongside Casillas, Buffon, and Thomas Myhre, he is the goalkeeper with the fewest goals conceded in a single edition of the European Championships, having conceded only one goal in the 1968 European Championships; of these players, only Zoff and Casillas won the title while achieving this feat.
Zoff's greatest accomplishment, however, came in the 1982 World Cup in Spain, where he captained Italy to victory in the tournament at the age of 40, making him the oldest ever winner of the World Cup; throughout the tournament, he kept two clean sheets, and produced a crucial goal-line save in the final minutes of the last second-round group match against favourites Brazil on 5 July, which enabled the Italians to earn a 3–2 victory and advance to the semi-finals of the competition. On 11 July, at the age of 40 years and 133 days, he became the oldest player ever to feature in a World Cup final; following Italy's 3–1 victory over West Germany at the Santiago Bernabéu Stadium in Madrid, he followed in the footsteps of compatriot Gianpiero Combi (1934) as only the second goalkeeper to captain a World Cup-winning side (later Iker Casillas and Hugo Lloris repeated this feat for Spain and France in the 2010 and 2018 World Cups respectively). Due to his performances, he was voted as the Best Goalkeeper of the Tournament. Regarding Zoff's importance during Italy's victorious World Cup campaign, his manager Enzo Bearzot said of him:
He was a level-headed goalkeeper, capable of staying calm during the toughest and the most exhilarating moments. He always held back both out of modesty and respect for his opponents. At the end of the Brazil match, he came over to give me a kiss on the cheek, without saying a single word. For me, that fleeting moment was the most intense of the entire World Cup.
During the flight of return from Spain on a DC-9 airplane, Zoff, Sandro Pertini (the Italian President of Republic), Causio and Bearzot were immortalized in a photo, suddenly gone highly popular, while playing card at scopone scientifico, an Italian social and team sport. In the previous years, the same aircraft had been used by Pertini and Pope John Paul II for private and institutional flights. In April 2017, it was put down back in the Museum of Volandia, near Varese.
Zoff also holds the record for the longest stretch (1,142 minutes) without allowing any goals in international football, set between 1972 and 1974. That clean sheet stretch was ended by Haitian player Manno Sanon's beautiful goal during Italy's 3–1 win over Haiti in the first round of the 1974 World Cup. Zoff made his final appearance for Italy on 29 May 1983, in a 2–0 away loss to Sweden, in a Euro 1984 qualifying match. At the time of his retirement, Zoff's 112 caps were the most ever by a member of the Italy national team. He currently sits in sixth place in this category, as well as second among goalkeepers, with Gianluigi Buffon having surpassed the latter record.