| 07 Sept 23 | T. Hazard Thorgan Hazard |  Borussia DortmundDOR | → |  AnderlechtAND | Undisclosed |
| 31 Aug 23 | N. Füllkrug Niclas Füllkrug |  Werder BremenSVW | → | Borussia DortmundDOR | Undisclosed |
| 11 Aug 23 | S. Coulibaly Soumaila Coulibaly | Borussia DortmundDOR | → |  AntwerpANT | Loan |
| 09 Aug 23 | N. Collins Nnamdi Collins | Borussia DortmundDOR | → |  Eintracht FrankfurtSGE | Undisclosed |
| 24 Jul 23 | M. Sabitzer Marcel Sabitzer |  Bayern MunichMUN | → | Borussia DortmundDOR | Undisclosed |
| 19 Jul 23 | G. Gurpuz Goktan Gurpuz | Borussia DortmundDOR | → |  TrabzonsporTRAB | Undisclosed |
| 03 Jul 23 | F. Nmecha Felix Nmecha |  VfL WolfsburgWOB | → | Borussia DortmundDOR | Undisclosed |
| 02 Jul 23 | J. Braaf Jayden Braaf | Borussia DortmundDOR | → |  Hellas VeronaVER | Undisclosed |
| 01 Jul 23 | F. Passlack Felix Passlack | Borussia DortmundDOR | → |  VfL BochumBOC | Free |
| 01 Jul 23 | A. Knauff Ansgar Knauff | Borussia DortmundDOR | → | Eintracht FrankfurtSGE | Undisclosed |
| 01 Jul 23 | J. Bellingham Jude Bellingham | Borussia DortmundDOR | → |  Real MadridRMA | Undisclosed |
| 01 Jul 23 | M. Dahoud Mahmoud Dahoud | Borussia DortmundDOR | → |  Brighton & Hove AlbionBHA | Free |
| 01 Jul 23 | T. Rothe Tom Rothe | Borussia DortmundDOR | → |  Holstein KielKIE | Loan |
| 01 Jul 23 | R. Guerreiro Raphaël Guerreiro | Borussia DortmundDOR | → | Bayern MunichMUN | Free |
| 01 Jul 23 | R. Bensebaini Ramy Bensebaini |  Borussia MonchengladbachBMG | → | Borussia DortmundDOR | Free |
| 31 Jan 23 | T. Hazard Thorgan Hazard | Borussia DortmundDOR | → |  PSV EindhovenPSV | Loan |
| 27 Jan 23 | J. Duranville Julien Duranville | AnderlechtAND | → | Borussia DortmundDOR | Undisclosed |
| 17 Jan 23 | J. Ryerson Julian Ryerson |  1. FC Union BerlinFCU | → | Borussia DortmundDOR | Undisclosed |