| 08 Aug 18 | O. Mangala Orel Mangala |  VfB StuttgartVFB | → |  Hamburg SVHSV | Loan |
| 16 Jul 18 | M. Zimmermann Matthias Zimmermann | VfB StuttgartVFB | → |  Fortuna DüsseldorfFOR | Free |
| 10 Jul 18 | N. González Nicolás González |  Argentinos JuniorsARGJ | → | VfB StuttgartVFB | 8500000 |
| 10 Jul 18 | N. González Nicolás González | Argentinos JuniorsARGJ | → | VfB StuttgartVFB | 8500000 |
| 01 Jul 18 | D. Kopacz David Kopacz |  Borussia DortmundDOR | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | R. Massimo Roberto Massimo |  Arminia BielefeldDSC | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | J. Onguene Jerome Onguene | VfB StuttgartVFB | → |  FC SalzburgSLZ | Undisclosed |
| 01 Jul 18 | B. Sosa Borna Sosa | DZXDinamo ZagrebDinamo Zagreb | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | D. Didavi Daniel Didavi |  VfL WolfsburgWOB | → | VfB StuttgartVFB | Free |
| 01 Jul 18 | J. Zimmer Jean Zimmer | VfB StuttgartVFB | → | Fortuna DüsseldorfFOR | Free |
| 01 Jul 18 | Ailton | VfB StuttgartVFB | → |  BragaBRAG | Loan |
| 01 Jul 18 | R. Massimo Roberto Massimo | VfB StuttgartVFB | → | Arminia BielefeldDSC | Loan |
| 01 Jul 18 | G. Castro Gonzalo Castro | Borussia DortmundDOR | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | D. Ginczek Daniel Ginczek | VfB StuttgartVFB | → | VfL WolfsburgWOB | Undisclosed |
| 01 Jul 18 | J. Green Julian Green | VfB StuttgartVFB | → |  SpVgg Greuther FurthFUR | Undisclosed |
| 01 Jul 18 | M. Kempf Marc-Oliver Kempf |  SC FreiburgFREI | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | P. Maffeo Pablo Maffeo |  Manchester CityMNC | → | VfB StuttgartVFB | Undisclosed |
| 01 Jul 18 | P. Maffeo Pablo Maffeo | Manchester CityMNC | → | VfB StuttgartVFB | Undisclosed |
| 14 May 18 | R. Massimo Roberto Massimo | Arminia BielefeldDSC | → | VfB StuttgartVFB | Undisclosed |
| 26 Jan 18 | J. Bruun Larsen Jacob Bruun Larsen | Borussia DortmundDOR | → | VfB StuttgartVFB | Loan |
| 25 Jan 18 | Ailton | VfB StuttgartVFB | → |  EstorilEST | Loan |
| 18 Jan 18 | E. Thommy Erik Thommy |  FC AugsburgAUG | → | VfB StuttgartVFB | Undisclosed |
| 11 Jan 18 | A. Grgic Anto Grgic | VfB StuttgartVFB | → |  FC SionSION | Loan |
| 01 Jan 18 | M. Gómez Mario Gómez | VfL WolfsburgWOB | → | VfB StuttgartVFB | Undisclosed |
| 01 Jan 18 | S. Terodde Simon Terodde | VfB StuttgartVFB | → |  FC CologneCOL | Undisclosed |