| 29 Aug 25 | F. Silva Fábio Silva |  Wolverhampton WanderersWOL | → |  Borussia DortmundDOR | Undisclosed |
| 27 Aug 25 | A. Anselmino Aaron Anselmino |  ChelseaCHE | → | Borussia DortmundDOR | Loan |
| 23 Aug 25 | G. Reyna Giovanni Reyna | Borussia DortmundDOR | → |  Borussia MönchengladbachBMG | Undisclosed |
| 18 Aug 25 | S. Haller Sébastien Haller | Borussia DortmundDOR | → |  FC UtrechtUTR | Undisclosed |
| 28 Jul 25 | D. Ramaj Diant Ramaj | Borussia DortmundDOR | → |  1. FC Heidenheim 1846HDH | Loan |
| 07 Jul 25 | S. Coulibaly Soumaila Coulibaly | Borussia DortmundDOR | → |  StrasbourgSTR | Undisclosed |
| 05 Jul 25 | J. Gittens Jamie Gittens | Borussia DortmundDOR | → | ChelseaCHE | Undisclosed |
| 01 Jul 25 | Y. Moukoko Youssoufa Moukoko | Borussia DortmundDOR | → |  F.C. KøbenhavnKBH | Undisclosed |
| 01 Jul 25 | D. Svensson Daniel Svensson |  FC NordsjællandFCN | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 25 | K. Wätjen Kjell-Arik Wätjen | Borussia DortmundDOR | → |  VfL BochumBOC | Loan |
| 01 Jul 25 | Y. Couto Yan Couto |  Manchester CityMNC | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 25 | P. Drewes Patrick Drewes | VfL BochumBOC | → | Borussia DortmundDOR | Undisclosed |
| 28 Jun 25 | Y. Moukoko Youssoufa Moukoko | Borussia DortmundDOR | → | F.C. KøbenhavnKBH | Undisclosed |
| 10 Jun 25 | J. Bellingham Jobe Bellingham |  SunderlandSUN | → | Borussia DortmundDOR | Undisclosed |
| 03 Feb 25 | D. Svensson Daniel Svensson | FC NordsjællandFCN | → | Borussia DortmundDOR | Loan |
| 03 Feb 25 | C. Chukwuemeka Carney Chukwuemeka | ChelseaCHE | → | Borussia DortmundDOR | Loan |
| 03 Feb 25 | D. Ramaj Diant Ramaj |  Ajax AmsterdamAJA | → | Borussia DortmundDOR | Undisclosed |
| 03 Feb 25 | D. Ramaj Diant Ramaj | Borussia DortmundDOR | → |  FC MidtjyllandMID | Loan |
| 14 Jan 25 | D. Malen Donyell Malen | Borussia DortmundDOR | → |  Aston VillaAVL | Undisclosed |