In the 2025–26 season, Sport Lisboa e Benfica marked their 122nd year of existence and their 92nd consecutive season in Portugal's top flight, competing in the Primeira Liga, domestic cups, and the UEFA Champions League. The club's most striking achievement was finishing the Primeira Liga season undefeated on May 16, 2026, yet still only placing third—a rare feat that has only occurred twice in league history. The campaign also included participation in the Taça da Liga, Taça de Portugal, and Supertaça Cândido de Oliveira, alongside a European run that began in the Champions League third qualifying round. Key scheduling milestones included the pre-season kickoff on 14 July 2025, and European draws held on 21 July, 4 August, 28 August 2025, and 30 January 2026. Despite the historic unbeaten domestic record, the third-place finish left the club without the league title, highlighting a unique and bittersweet chapter in their storied history.