The 1986–87 season was Sport Lisboa e Benfica's 83rd season in existence and the club's 53rd consecutive season in the top flight of Portuguese football, covering the period from 1 July 1986 to 30 June 1987. Benfica competed domestically in the Primeira Divisão, Taça de Portugal and the Supertaça Cândido de Oliveira, and participated in the Cup Winners' Cup after winning the Taça de Portugal in the previous season.

Following a close-call title race in the past season, Benfica sought to win the title that escaped since 1984. Only small adjustments were made to the squad, a new forward, Chiquinho Carlos, and two new centre-backs, Dito and Edmundo, countered the loss of Nené. Despite a slow start, by early November, Benfica was leading the league by two points after six consecutive wins. A shocking 7–1 defeat to Sporting saw Porto match them in first place, but the team reacted with a 3–1 win against their challengers, bringing back first place isolated. A draw and five wins in a row followed, with Benfica finally securing the title on 24 May, after three consecutive draws that threatened the lead. The season closed with another Taça de Portugal win, the third in a row and the sixth in eight years, therefore completing the double, a feat the club would have to wait nearly 30 years to repeat.

Benfica entered the new season trying to recover from the dramatic season finale of the past league, when John Mortimore squandered a two-point lead in the last two match-days, costing Benfica the title. Mortimore remained in charge, but very few changes were made to his roster. A new forward, Chiquinho Carlos, plus two new centre-backs, Dito and Edmundo. On the other end, Nené retired and Michael Manniche nearly left, but was persuaded to do another season. The pre-season began on 9 July with medicals, and the first game was on the 26 with Portimonense, followed by the presentation game of Vitória de Setúbal on 1 August. Afterwards Benfica played two games with Southampton, one in Lisbon and one in England, and competed in the Lisbon International Tournament, winning it. Due to the events occurred in the 1986 Taça de Portugal Final, the Portuguese Football Federation punished Benfica with a one-game interdiction of Estádio da Luz. The club selected Estádio Nacional as the alternative for the home reception in match-day two.

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