DD Denis Donkor | In | 2026-08-26 | - | HI Hoffenheim II HOF | RO Rot-weiss Oberhausen OBE |
AA A. Aourir | Out | 2026-08-07 | Free agent | RORot-weiss Oberhausen OBE | VU Vukovar |
| AAA. Aourir | Out | 2026-08-06 | Free agent | RORot-weiss Oberhausen OBE | VUVukovar |
JZ J. Vega Zambrano | In | 2026-08-05 | Transfer | FK FC Viktoria Köln KOL | RORot-weiss Oberhausen OBE |
| JZJ. Vega Zambrano | In | 2026-08-04 | Transfer | FKFC Viktoria Köln KOL | RORot-weiss Oberhausen OBE |
AS A. Sune | In | 2026-07-23 | Free agent | KI Köln II KOL | RORot-weiss Oberhausen OBE |
AS Arda Süne | In | 2026-07-23 | Free agent | KIKöln II KOL | RORot-weiss Oberhausen OBE |
NG N. Glaus | In | 2026-07-20 | Free agent | GR Grasshoppers GRA | RORot-weiss Oberhausen OBE |
| NGN. Glaus | In | 2026-07-19 | Free agent | GRGrasshoppers GRA | RORot-weiss Oberhausen OBE |
TJ T. de Jong | In | 2026-07-09 | - | S0 SC Paderborn 07 PAD | RORot-weiss Oberhausen OBE |
| TJT. de Jong | In | 2026-07-08 | - | S0SC Paderborn 07 PAD | RORot-weiss Oberhausen OBE |
KY K. Yalcin | In | 2026-07-05 | Free agent | S0SC Paderborn 07 PAD | RORot-weiss Oberhausen OBE |
| KYK. Yalcin | In | 2026-07-04 | Free agent | S0SC Paderborn 07 PAD | RORot-weiss Oberhausen OBE |
NW N. Winter | In | 2026-07-01 | Free agent | AA Alemannia Aachen ALE | RORot-weiss Oberhausen OBE |
NW N. Winter | In | 2026-07-01 | Free agent | AAAlemannia Aachen ALE | RORot-weiss Oberhausen OBE |
HS Hong Seok-Ju | Out | 2026-06-30 | Free agent | RORot-weiss Oberhausen OBE | PE Patro Eisden PAT |
TB T. Bohmer | In | 2026-06-30 | Free agent | WI Wiedenbrück WIE | RORot-weiss Oberhausen OBE |
EG E. B. Gueye | Out | 2026-06-30 | Free agent | RORot-weiss Oberhausen OBE | FKFC Viktoria Köln KOL |
TB T. Böhmer | In | 2026-06-30 | Free agent | WIWiedenbrück WIE | RORot-weiss Oberhausen OBE |
TK T. Krohn | Out | 2026-06-29 | Return from loan | RORot-weiss Oberhausen OBE | HR Hansa Rostock HAN |
| HSHong Seok-Ju | Out | 2026-06-29 | Free agent | RORot-weiss Oberhausen OBE | PEPatro Eisden PAT |
| EGE. B. Gueye | Out | 2026-06-29 | Free agent | RORot-weiss Oberhausen OBE | FKFC Viktoria Köln KOL |
DM D. Murray | Out | 2026-06-24 | Return from loan | RORot-weiss Oberhausen OBE | SF SC Freiburg FRE |
| TKT. Krohn | In | 2026-01-08 | Loan | HRHansa Rostock HAN | RORot-weiss Oberhausen OBE |
CS Christopher Schepp | Out | 2026-01-07 | Transfer | RORot-weiss Oberhausen OBE | HA Havelse HAV |
| CSChristopher Schepp | Out | 2026-01-06 | Transfer | RORot-weiss Oberhausen OBE | HAHavelse HAV |
MK M. Kourouma | Out | 2025-12-31 | Free agent | RORot-weiss Oberhausen OBE | UP Union Titus Petange |
| MKM. Kourouma | Out | 2025-12-30 | Free agent | RORot-weiss Oberhausen OBE | UPUnion Titus Petange |
| DMD. Murray | In | 2025-08-03 | Loan | FI Freiburg II FRE | RORot-weiss Oberhausen OBE |
| DMD. Murray | In | 2025-08-02 | Loan | SFSC Freiburg FRE | RORot-weiss Oberhausen OBE |
| HSHong Seok-Ju | In | 2025-07-28 | Free agent | F0 FC Schalke 04 SCH | RORot-weiss Oberhausen OBE |
TK T. Kesim | Out | 2025-07-01 | Free Transfer | RORot-weiss Oberhausen OBE | HI Hertha BSC II HER |
DB D. Berisha | Out | 2025-07-01 | Free Transfer | RORot-weiss Oberhausen OBE | SL Sportfreunde Lotte LOT |
TB T. Bonga | Out | 2025-07-01 | Free Transfer | RORot-weiss Oberhausen OBE | WK Würzburger Kickers WUR |
TB T. Böhm | Out | 2025-07-01 | Free Transfer | RORot-weiss Oberhausen OBE | SV SSVg Velbert VEL |
CE C. Ezekwem | Out | 2025-07-01 | Free Transfer | RORot-weiss Oberhausen OBE | SR SV Rodinghausen ROD |
DD D. Donkor | Out | 2025-07-01 | Free Transfer | RORot-weiss Oberhausen OBE | HIHoffenheim II HOF |
| AAA. Aourir | In | 2025-06-30 | Free agent | EH Eintracht Hohkeppel | RORot-weiss Oberhausen OBE |
BN B. Nyuydine | In | 2025-06-30 | Free agent | SLSportfreunde Lotte LOT | RORot-weiss Oberhausen OBE |
| MKM. Kourouma | In | 2025-06-30 | Free agent | RE Rot-Weiß Essen RWE | RORot-weiss Oberhausen OBE |
DB D. Berisha | Out | 2025-06-30 | Free agent | RORot-weiss Oberhausen OBE | SLSportfreunde Lotte LOT |
| KYK. Yalcin | Out | 2025-06-30 | Free agent | RORot-weiss Oberhausen OBE | S0SC Paderborn 07 PAD |
| DDDenis Donkor | Out | 2025-06-30 | - | RORot-weiss Oberhausen OBE | HIHoffenheim II HOF |
AM A. Mühling | In | 2025-06-30 | Free agent | SS SV Sandhausen SAN | RORot-weiss Oberhausen OBE |
LH L. Halangk | In | 2025-06-30 | Free agent | HF Hallescher FC HAL | RORot-weiss Oberhausen OBE |
| CSChristopher Schepp | In | 2025-06-30 | Free agent | SM SV Meppen MEP | RORot-weiss Oberhausen OBE |
IP I. Poliakov | In | 2025-06-30 | Free agent | VE Verl VER | RORot-weiss Oberhausen OBE |
| DDDenis Donkor | Out | 2025-06-29 | - | RORot-weiss Oberhausen OBE | HIHoffenheim II HOF |
| DBD. Berisha | Out | 2025-06-29 | Free agent | RORot-weiss Oberhausen OBE | SLSportfreunde Lotte LOT |
AB A. Berzel | Out | 2025-06-29 | Free agent | RORot-weiss Oberhausen OBE | — |
