The 1981–82 season was Sport Lisboa e Benfica's 78th season in existence and the club's 48th consecutive season in the top flight of Portuguese football, covering the period from 1 July 1981 to 30 June 1982. Benfica competed domestically in the Primeira Divisão, and the Supertaça Cândido de Oliveira, and participated in the European Cup after winning the previous league.