The 2019–20 season was the 55th season in 1. FC Union Berlin's history and their first season in the top flight of German football, the Bundesliga, having been promoted from the 2. Bundesliga in 2019. In addition to the domestic league, Union Berlin also participated in the season's edition of the domestic cup, the DFB-Pokal. Since their foundation, Union have played in the Stadion An der Alten Försterei, located in Berlin, Germany. The season covered a period from 1 July 2019 to 30 June 2020.