| 31 Aug 17 | J. Sancho Jadon Sancho |  Manchester CityMNC | → |  Borussia DortmundDOR | Undisclosed |
| 31 Aug 17 | J. Sancho Jadon Sancho | Manchester CityMNC | → | Borussia DortmundDOR | Undisclosed |
| 30 Aug 17 | F. Passlack Felix Passlack | Borussia DortmundDOR | → |  TSG HoffenheimHOF | Loan |
| 30 Aug 17 | J. Toljan Jeremy Toljan | TSG HoffenheimHOF | → | Borussia DortmundDOR | Undisclosed |
| 29 Aug 17 | E. Mor Emre Mor | Borussia DortmundDOR | → |  Celta VigoCEL | Undisclosed |
| 29 Aug 17 | E. Mor Emre Mor | Borussia DortmundDOR | → | Celta VigoCEL | Undisclosed |
| 28 Aug 17 | A. Yarmolenko Andriy Yarmolenko | DKXDynamo KievDynamo Kiev | → | Borussia DortmundDOR | Undisclosed |
| 28 Aug 17 | O. Dembélé Ousmane Dembélé | Borussia DortmundDOR | → |  BarcelonaBAR | 105000000 |
| 28 Aug 17 | O. Dembélé Ousmane Dembélé | Borussia DortmundDOR | → | BarcelonaBAR | 105000000 |
| 28 Jul 17 | M. Merino Mikel Merino | Borussia DortmundDOR | → |  Newcastle UnitedNEW | Loan |
| 28 Jul 17 | M. Merino Mikel Merino | Borussia DortmundDOR | → | Newcastle UnitedNEW | Loan |
| 13 Jul 17 | S. Bender Sven Bender | Borussia DortmundDOR | → |  Bayer LeverkusenLEV | Undisclosed |
| 10 Jul 17 | D. Burnic Dzenis Burnic | Borussia DortmundDOR | → |  VfB StuttgartVFB | Loan |
| 04 Jul 17 | M. Ginter Matthias Ginter | Borussia DortmundDOR | → |  Borussia MonchengladbachMON | Undisclosed |
| 01 Jul 17 | Dan-Axel Zagadou |  Paris Saint-Germain PSG | → | Borussia DortmundDOR | Free |
| 01 Jul 17 | M. Dahoud Mahmoud Dahoud | Borussia MonchengladbachMON | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 17 | M. Philipp Maximilian Philipp |  SC FreiburgFREI | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 17 | P. Stenzel Pascal Stenzel | Borussia DortmundDOR | → | SC FreiburgFREI | Undisclosed |
| 01 Jul 17 | Ö. Toprak Ömer Toprak | Bayer LeverkusenLEV | → | Borussia DortmundDOR | Undisclosed |
| 01 Jul 17 | Dan-Axel Zagadou | Paris Saint-Germain PSG | → | Borussia DortmundDOR | Free |
| 26 Jan 17 | N. Subotic Neven Subotic | Borussia DortmundDOR | → |  FC CologneCOL | Loan |
| 26 Jan 17 | A. Ramos Adrián Ramos | Borussia DortmundDOR | → |  GranadaGCF | Loan |
| 26 Jan 17 | A. Ramos Adrián Ramos | Borussia DortmundDOR | → | GranadaGCF | Loan |
| 24 Jan 17 | A. Ramos Adrián Ramos | Borussia DortmundDOR | → | GranadaGCF | Loan |
| 24 Jan 17 | A. Ramos Adrián Ramos | Borussia DortmundDOR | → | GranadaGCF | Loan |
| 23 Jan 17 | A. Isak Alexander Isak |  AIKAIK | → | Borussia DortmundDOR | Undisclosed |