| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| GK | Andreas Luthe | 1987-03-10 | 195 | 85 | 2020-06-30 | ||
| GK | 1 | Daniel Mesenhöler | 1995-07-24 | 187 | 81 | 2018-06-30 | |
| GK | 12 | Jakob Busk Jensen | 1993-09-12 | 189 | 78 | 2020-06-30 | |
| GK | Michael Gspurning | 1981-05-02 | 196 | 95 | 2017-06-30 | ||
| D | 5 | Benjamin Kessel | 1987-10-01 | 191 | 2017-06-30 | ||
| D | 25 | Christopher Lenz | 1994-09-22 | 180 | 2018-06-30 | ||
| D | 28 | Christopher Trimmel | 1987-02-24 | 189 | 80 | 2017-06-30 | |
| D | 3 | Emanuel Pogatetz | 1983-01-16 | 191 | 76 | 2017-06-30 | |
| D | 34 | Fabian Schönheim | 1987-02-14 | 191 | 83 | 2019-06-30 | |
| D | Florian Hübner | 1991-03-01 | 191 | - | 2017-06-30 | ||
| D | 6 | Kristian Pedersen | 1994-08-04 | 189 | 83 | 2017-06-30 | |
| D | 29 | Michael Parensen | 1986-06-24 | 180 | 2018-06-30 | ||
| D | 4 | Roberto Puncec | 1991-10-27 | 188 | 2017-06-30 | ||
| D | Robin Knoche | 1992-05-22 | 190 | 77 | 2017-06-30 | ||
| D | 37 | Toni Leistner | 1990-08-19 | 190 | 2017-06-30 | ||
| M | 14 | Adrian Nikci | 1989-11-10 | 183 | 75 | 2017-06-30 | |
| M | 7 | Benjamin Köhler | 1980-08-04 | 172 | 66 | 2017-06-30 | |
| M | Christian Gentner | 1985-08-14 | 189 | 80 | 2019-06-30 | ||
| M | 2 | Christopher Quiring | 1990-11-23 | 172 | 2017-06-30 | ||
| M | 19 | Damir Kreilach | 1989-04-16 | 186 | 79 | 2019-06-30 | |
| M | 10 | Dennis Daube | 1989-07-11 | 185 | 2017-06-30 | ||
| M | 27 | Eroll Zejnullahu | 1994-10-19 | 180 | 2018-06-30 | ||
| M | 23 | Felix KroosC | 1991-03-12 | 184 | 74 | 2017-06-30 | |
| M | 18 | Kenny Prince Redondo | 1994-08-29 | 181 | 2017-06-30 | ||
| M | 39 | Lukas Lämmel | 1997-09-08 | 179 | 2018-06-30 | ||
| M | Manuel Schmiedebach | 1988-12-05 | 171 | 68 | 2018-06-30 | ||
| M | 13 | Raffael Korte | 1990-08-29 | 175 | 2017-06-30 | ||
| M | Simon Hedlund | 1993-03-11 | 175 | 68 | 2020-06-30 | ||
| M | 8 | Stephan Fürstner | 1987-09-11 | 178 | 71 | 2017-06-30 | |
| F | 21 | Collin Quaner | 1991-06-17 | 191 | 2017-06-30 | ||
| F | 11 | Maximilian Thiel | 1993-02-03 | 187 | - | 2017-06-30 | |
| F | 16 | Philipp Hosiner | 1989-05-15 | 178 | 75 | 2019-06-30 | |
| F | Sebastian Polter | 1991-04-01 | 192 | 88 | 2018-06-30 | ||
| F | 9 | Sören Brandy | 1985-05-06 | 182 | 2017-06-30 | ||
| F | 24 | Steven Skrzybski | 1992-11-18 | 173 | 2018-06-30 |
| Date | Home Team | Score | Away Team | Tournament |
|---|---|---|---|---|
| 21/09/2019 | Bayer 04 Leverkusen | 2 - 0 | FC Union Berlin | Bundesliga |
| 27/09/2019 | FC Union Berlin | 1 - 2 | Eintracht Frankfurt | Bundesliga |
| 06/10/2019 | VfL Wolfsburg | 1 - 0 | FC Union Berlin | Bundesliga |
| 19/10/2019 | FC Union Berlin | 2 - 0 | SC Freiburg | Bundesliga |
| 26/10/2019 | FC Bayern München | 2 - 1 | FC Union Berlin | Bundesliga |
| 02/11/2019 | FC Union Berlin | 1 - 0 | Hertha BSC Berlin | Bundesliga |
| 09/11/2019 | FSV Mainz 05 | 2 - 3 | FC Union Berlin | Bundesliga |
| 23/11/2019 | FC Union Berlin | 2 - 0 | Borussia Mönchengladbach | Bundesliga |
| 29/11/2019 | FC Schalke 04 | 2 - 1 | FC Union Berlin | Bundesliga |
| 08/12/2019 | FC Union Berlin | 2 - 0 | FC Köln | Bundesliga |
| 14/12/2019 | SC Paderborn 07 | 1 - 1 | FC Union Berlin | Bundesliga |
| 17/12/2019 | FC Union Berlin | 0 - 2 | TSG 1899 Hoffenheim | Bundesliga |
| 22/12/2019 | Fortuna Düsseldorf | 2 - 1 | FC Union Berlin | Bundesliga |
| 18/01/2020 | RB Leipzig | 3 - 1 | FC Union Berlin | Bundesliga |
| 25/01/2020 | FC Union Berlin | 2 - 0 | FC Augsburg | Bundesliga |
| 01/02/2020 | Borussia Dortmund | 5 - 0 | FC Union Berlin | Bundesliga |
| 08/02/2020 | SV Werder Bremen | 0 - 2 | FC Union Berlin | Bundesliga |
| 15/02/2020 | FC Union Berlin | 2 - 3 | Bayer 04 Leverkusen | Bundesliga |
| 24/02/2020 | Eintracht Frankfurt | 1 - 2 | FC Union Berlin | Bundesliga |
| 01/03/2020 | FC Union Berlin | 2 - 2 | VfL Wolfsburg | Bundesliga |
| 07/03/2020 | SC Freiburg | 3 - 1 | FC Union Berlin | Bundesliga |
| 17/05/2020 | FC Union Berlin | 0 - 2 | FC Bayern München | Bundesliga |
| 22/05/2020 | Hertha BSC Berlin | 4 - 0 | FC Union Berlin | Bundesliga |
| 27/05/2020 | FC Union Berlin | 1 - 1 | FSV Mainz 05 | Bundesliga |
| 31/05/2020 | Borussia Mönchengladbach | 4 - 1 | FC Union Berlin | Bundesliga |
| 07/06/2020 | FC Union Berlin | 1 - 1 | FC Schalke 04 | Bundesliga |
| 13/06/2020 | FC Köln | 1 - 2 | FC Union Berlin | Bundesliga |
| 16/06/2020 | FC Union Berlin | 1 - 0 | SC Paderborn 07 | Bundesliga |
| 20/06/2020 | TSG 1899 Hoffenheim | 4 - 0 | FC Union Berlin | Bundesliga |
| 27/06/2020 | FC Union Berlin | 3 - 0 | Fortuna Düsseldorf | Bundesliga |
| 19/09/2020 | FC Union Berlin | 1 - 3 | FC Augsburg | Bundesliga |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 10.Jan | Sebastian Polter (F) | Queens Park Rangers | FC Union Berlin | Confirmed | |
| 29.Aug | Simon Hedlund (M) | IF Elfsborg | FC Union Berlin | Confirmed | |
| 28.Jun | Philipp Hosiner (F) | Stade Rennais FC | FC Union Berlin | Confirmed | |
| 25.Jun | Kristian Pedersen (D) | HB Köge | FC Union Berlin | Confirmed | |
| 13.Jun | Felix Kroos (M) | SV Werder Bremen | FC Union Berlin | Confirmed | |
| 31.May | Felix Kroos (M) | FC Union Berlin | SV Werder Bremen | Confirmed | |
| 15.May | Bobby Wood (F) | FC Union Berlin | Hamburger SV | Confirmed | |
| 12.May | Jakob Busk Jensen (GK) | FC Union Berlin | FC Union Berlin | Extension | |
| 28.Jan | Felix Kroos (M) | SV Werder Bremen | FC Union Berlin | Confirmed | |
| 15.Jan | Jakob Busk Jensen (GK) | FC København | FC Union Berlin | Confirmed |