| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| D | Christian Stuff | 1982-08-11 | 198 | 2014 Jun | |||
| D | Christoph Menz | 1988-12-22 | 185 | 2013 Jun | |||
| D | Daniel Göhlert | 1980-09-25 | 188 | 2013 Jun | |||
| D | Patrick Kohlmann | 1983-02-25 | 180 | 2014 jun | |||
| M | Dominic Peitz | 1984-09-11 | 196 | 2016-06-30 | |||
| F | Chinedu Ede | 1987-02-05 | 178 | 78 | 2017-06-30 | ||
| F | John Jairo Mosquera | 1988-01-15 | 192 | 2015 Jun | |||
| F | Karim Benyamina | 1981-12-18 | 178 | 2014 Jun |
| 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 |