| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| GK | 40 | Baboucarr Gaye | 1998-02-24 | 194 | 2019-06-30 | ||
| GK | 34 | Daniel Davari | 1988-01-06 | 192 | 85 | 2017-06-30 | |
| GK | 33 | Nikolai Rehnen | 1997-02-04 | 189 | 2018-06-30 | ||
| GK | 1 | Wolfgang Hesl | 1986-01-13 | 186 | 87 | 2017-06-30 | |
| D | 3 | Brian Behrendt | 1991-10-24 | 187 | 2018-06-30 | ||
| D | 23 | Florian Dick | 1984-11-09 | 184 | 2017-06-30 | ||
| D | 28 | Florian Hartherz | 1993-05-29 | 187 | 82 | 2017-06-30 | |
| D | Joakim Nilsson | 1994-02-16 | 185 | 78 | 2020-12-31 | ||
| D | 13 | Julian Börner | 1991-01-21 | 188 | 2019-06-30 | ||
| D | 4 | Malcolm Cacutalua | 1994-11-15 | 188 | - | 2018-06-30 | |
| D | 14 | Manuel Hornig | 1982-12-18 | 190 | 2017-06-30 | ||
| D | 27 | Sebastian Schuppan | 1986-07-18 | 187 | 2017-06-30 | ||
| D | 2 | Steffen Lang | 1993-08-14 | 178 | 2017-06-30 | ||
| D | 11 | Stephan Salger | 1990-01-30 | 183 | 73 | 2018-06-30 | |
| M | Allan Firmino Dantas | 1997-01-28 | 178 | 2017-06-30 | |||
| M | 8 | Daniel Brinkmann | 1986-01-29 | 193 | 2017-06-30 | ||
| M | 5 | David Ulm | 1984-06-30 | 174 | 2017-06-30 | ||
| M | 32 | Keanu Staude | 1997-01-26 | 175 | 2017-06-30 | ||
| M | 20 | Manuel Junglas | 1989-01-31 | 187 | 2017-06-30 | ||
| M | 19 | Manuel Prietl | 1991-08-03 | 187 | 2018-06-30 | ||
| M | 7 | Michael Görlitz | 1987-03-08 | 172 | 71 | 2017-06-30 | |
| M | 6 | Tom Schûtz | 1988-01-20 | 181 | 2018-06-30 | ||
| M | 10 | Tomasz Holota | 1991-01-27 | 182 | 2018-06-30 | ||
| F | 21 | Andreas Voglsammer | 1992-01-09 | 178 | - | 2018-06-30 | |
| F | 17 | Christoph Hemlein | 1990-12-16 | 181 | 76 | 2018-06-30 | |
| F | 18 | Christopher Nöthe | 1988-01-03 | 184 | 75 | 2017-06-30 | |
| F | 9 | Fabian KlosC | 1987-12-02 | 194 | 2019-06-30 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 11.Jul | Joakim Nilsson (D) | IF Elfsborg | Arminia Bielefeld | Confirmed | |
| 30.Jun | Leandro Putaro (F) | Arminia Bielefeld | VfL Wolfsburg | Confirmed | |
| 30.Jun | Michal Mak (F) | Arminia Bielefeld | Lechia Gdansk | Confirmed | |
| 31.Aug | Michal Mak (F) | Lechia Gdansk | Arminia Bielefeld | Confirmed | |
| 24.Jan | Francisco Rodríguez (D) | VfL Wolfsburg | Arminia Bielefeld | Confirmed | |
| 5.Jan | Amin Affane (M) | Arminia Bielefeld | AIK | Confirmed | |
| 25.Dec | Amin Affane (M) | Arminia Bielefeld | AIK | Rumour | |
| 14.Jun | Kenneth Zohore (F) | ACF Fiorentina | Arminia Bielefeld | Rumour | |
| 6.Aug | Kasper Risgård (M) | Arminia Bielefeld | Aalborg BK | Doubtful | |
| 3.Aug | Jonas Kamper (M) | Arminia Bielefeld | Randers FC | Confirmed |