Original Puma football shirt Borussia Dortmund 2018/19

The 2018–19 Borussia Dortmund season was the 110th season in the football club's history and 43rd consecutive and 52nd overall season in the top flight of German football, the Bundesliga, having been promoted from the 2. Bundesliga Nord in 1976.

In addition to the domestic league, Borussia Dortmund also participated in the season's editions of the domestic cup, the DFB-Pokal, and the first-tier continental cup, the UEFA Champions League. This was the 45th season for Dortmund in the Signal Iduna Park, located in Dortmund, North Rhine-Westphalia, Germany. The season covered a period from 1 July 2018 to 30 June 2019.

The season was the first since 2001–02 without Roman Weidenfeller, who retired after the 2017–18 season.