FC Union Berlin season was the club's 56th season in existence and the second consecutive season in the top flight of German football, the Bundesliga.

The season covered the period from 1 July 2020 to 30 June 2021.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Players may hold more than one non-FIFA nationality.

Source: DFB The league fixtures were announced on 7 August 2020.