2023–24 1. FC Union Berlin season

The 2023–24 season was 1. FC Union Berlin's 118th season in existence and fifth consecutive season in the Bundesliga. They also competed in the DFB-Pokal and the UEFA Champions League for the first time.

Matches
The league fixtures were unveiled on 30 June 2023.

Group stage
The draw for the group stage was held on 31 August 2023.

Appearances and goals
! colspan="18" style=background:#dcdcdc; text-align:center| Goalkeepers

! colspan="18" style=background:#dcdcdc; text-align:center| Defenders

! colspan="18" style=background:#dcdcdc; text-align:center| Midfielders

! colspan="18" style=background:#dcdcdc; text-align:center| Forwards

! colspan="18" style=background:#dcdcdc; text-align:center| Players transferred out during the season