Transfer-History
| Termin | Name | Pos | St. | Alter | | kam von | | ging zu | Ablöse |
|---|
| 20.04.2021 | Wolf, Marius | RVRM | 76 | 23 |  | 1. FC Union Berlin |  | SSV Jahn Regensburg | 971.251 € |
| 19.04.2021 | Gruezo, Carlos | - | 72 | 23 |  | 1. FC Kaiserslautern | | 1. FC Union Berlin | 210.000 € |
| 13.04.2021 | Andermatt, Nicolas | - | 63 | 23 |  | FC Viktoria Köln | | 1. FC Union Berlin | 34.567 € |
| 13.04.2021 | Lang, Steffen | - | 63 | 25 | | FC Viktoria Köln | | 1. FC Union Berlin | 43.210 € |
| 13.04.2021 | Gikiewicz, Rafal | TW | 79 | 31 | | 1. FC Union Berlin |  | FC Bayern München | 1.000.000 € |
| 06.04.2021 | Behrens, Hanno | - | 70 | 28 | | 1. FC Union Berlin | | SSV Jahn Regensburg | 165.375 € |
| 06.04.2021 | Mölders, Sascha | - | 68 | 33 | | FC Viktoria Köln | | 1. FC Union Berlin | 70.001 € |
| 10.01.2021 | Halstenberg, Marcel | - | 82 | 27 | | 1. FC Union Berlin |  | SV Waldhof Mannheim 07 | 101 € |
| 26.12.2020 | Tisserand, Marcel | IV | 73 | 25 |  | DSC Arminia Bielefeld | | 1. FC Union Berlin | 1 € |
| 17.12.2020 | Özil, Mesut | - | 82 | 30 | | 1. FC Union Berlin |  | Projektleitung | 1 € |
| 17.12.2020 | Füllkrug, Niclas | ST | 76 | 25 | | 1. FC Union Berlin | | Projektleitung | 1 € |
| 02.12.2020 | Zrelak, Adam | ST | 66 | 24 |  | VfB Lübeck | | 1. FC Union Berlin | 101 € |
| 30.11.2020 | Vunguidica, José Pierre | - | 61 | 28 |  | 1. FC Saarbrücken | | 1. FC Union Berlin | 300 € |
| 30.11.2020 | Drinkuth, Felix | - | 62 | 24 |  | FSV Zwickau | | 1. FC Union Berlin | 150.001 € |
| 23.11.2020 | Marinovic, Stefan | - | 71 | 27 |  | 1. FC Nürnberg | | 1. FC Union Berlin | 84.000 € |
| 20.11.2020 | Buballa, Daniel | - | 68 | 28 | | 1. FC Union Berlin |  | FC Erzgebirge Aue | 432.100 € |
| 20.11.2020 | Bell, Stefan | IV | 73 | 27 | | 1. FC Union Berlin |  | SV Darmstadt 98 | 50.000 € |
| 16.11.2020 | Mamba, Streli | RFRMLF | 67 | 24 |  | VDFB Transferteam | | 1. FC Union Berlin | 1.250.251 € |
| 13.11.2020 | Müller, Leon | ZDMZM | 57 | 18 |  | FC Augsburg | | 1. FC Union Berlin | 101 € |
| 11.11.2020 | Klement, Phillipp | - | 70 | 26 | | 1. FC Union Berlin |  | F.C. Hansa Rostock | 80.000 € |
| 03.11.2020 | Yildirim, Aygün | - | 65 | 23 |  | SC Verl | | 1. FC Union Berlin | 217.272 € |
| 02.11.2020 | Rodríguez, James | ZOMRMZM | 82 | 27 | | 1. FC Union Berlin | | DSC Arminia Bielefeld | 700.001 € |
| 02.11.2020 | Bader, Matthias | RVRMZM | 70 | 21 | | 1. FC Union Berlin |  | 1. FSV Mainz 05 | 105.001 € |
| 26.10.2020 | Zenga, Erik | - | 65 | 25 | | 1. FC Union Berlin |  | Eintracht Frankfurt | 157.501 € |
| 26.10.2020 | Özil, Mesut | - | 82 | 30 |  | Borussia Mönchengladbach | | 1. FC Union Berlin | 1.000.000 € |