The 2025–26 season is the 122nd season in the history of Bayer 04 Leverkusen, and the club's 47th consecutive season in the top flight of German football.
The 2024–25 season was the 18th season in the history of 1. FC Heidenheim as a legally independent club, and the club's second consecutive season in the Bundesliga.
The 2023–24 season was Bayer 04 Leverkusen's 120th season in existence and 45th consecutive season in the Bundesliga. They also competed in the DFB-Pokal and the UEFA Europa League.