1980–81 S.L. Benfica season

The 1980–81 season was Sport Lisboa e Benfica's 77th season in existence and the club's 47th consecutive season in the top flight of Portuguese football, covering the period from 1 July 1980 to 30 June 1981. Benfica competed domestically in the Primeira Divisão, Taça de Portugal and the Supertaça de Portugal, and participated in the Cup Winners' Cup after winning the Taça de Portugal in the previous season.

In the new season, Mário Wilson was replaced by Lajos Baróti. In the transfer season, major signings included António Veloso, Francisco Vital and João Alves, who returned to the club. Benfica's league campaign started with seven consecutive wins, before a first loss with Porto in the Clássico. A few days later, Benfica wins their first Supertaça de Portugal. In the Cup Winners' Cup, Benfica eliminated Altay, Dinamo Zagreb and Malmö in the first three rounds. In late November, Benfica draws with Sporting and three weeks later, with Vitória de Setúbal, lapping the first half in first place with a three-point lead. In the following weeks, Benfica won three more matches before losing another point in a draw with Penafiel, which cut his lead to two points. They reacted with four more wins, including a home win against Porto, which widened their difference to four points. Meanwhile, in Europe, Benfica defeated Fortuna Düsseldorf in quarter-finals but was knocked-out by Carl Zeiss Jena in the semis. The final two months of the Primeira Divisão saw Benfica drop points with Académico de Viseu, Vitória de Guimarães and Sporting, reducing their lead to two points. On match-day 29, a home win against Setúbal secured their 24th league title. They concluded the season by winning their 17th Taça de Portugal in a 3–1 win against Porto.