| 20 Sept 17 | J. Ledley Joe Ledley | XXX | → |  Derby CountyDER | Free |
| 31 Aug 17 | S. Winnall Sam Winnall |  Sheffield WednesdaySHW | → | Derby CountyDER | Loan |
| 31 Aug 17 | J. Butterfield Jacob Butterfield | Derby CountyDER | → | Sheffield WednesdaySHW | Loan |
| 31 Aug 17 | F. Rawson Farrend Rawson | Derby CountyDER | → |  Accrington StanleyACCR | Loan |
| 31 Aug 17 | K. Gordon Kellan Gordon | Derby CountyDER | → |  Swindon TownSWI | Loan |
| 31 Aug 17 | T. Elsnik Timi Max Elsnik | Derby CountyDER | → | Swindon TownSWI | Loan |
| 31 Aug 17 | C. Bryson Craig Bryson | Derby CountyDER | → |  Cardiff CityCAR | Loan |
| 31 Aug 17 | M. Kieftenbeld Maikel Kieftenbeld |  Birmingham CityBIR | → | Derby CountyDER | Undisclosed |
| 18 Aug 17 | N. Blackman Nick Blackman | Derby CountyDER | → |  Maccabi Tel-AvivMTA | Loan |
| 15 Aug 17 | T. Lawrence Tom Lawrence |  Leicester CityLEI | → | Derby CountyDER | Undisclosed |
| 15 Aug 17 | T. Lawrence Tom Lawrence | Leicester CityLEI | → | Derby CountyDER | Undisclosed |
| 15 Jul 17 | T. Huddlestone Tom Huddlestone |  Hull CityHUL | → | Derby CountyDER | Undisclosed |
| 07 Jul 17 | C. Christie Cyrus Christie | Derby CountyDER | → |  MiddlesbroughMID | Undisclosed |
| 04 Jul 17 | T. Ince Tom Ince | Derby CountyDER | → |  Huddersfield TownHUD | Undisclosed |
| 04 Jul 17 | T. Ince Tom Ince | Derby CountyDER | → | Huddersfield TownHUD | Undisclosed |
| 03 Jul 17 | A. Wisdom Andre Wisdom |  LiverpoolLIV | → | Derby CountyDER | Undisclosed |
| 03 Jul 17 | A. Wisdom Andre Wisdom | LiverpoolLIV | → | Derby CountyDER | Undisclosed |
| 01 Jul 17 | W. Hughes Will Hughes | Derby CountyDER | → |  WatfordWAT | Undisclosed |
| 01 Jul 17 | C. Davies Curtis Davies | Hull CityHUL | → | Derby CountyDER | Undisclosed |
| 01 Jul 17 | C. Davies Curtis Davies | Hull CityHUL | → | Derby CountyDER | Undisclosed |
| 01 Jul 17 | W. Hughes Will Hughes | Derby CountyDER | → | WatfordWAT | Undisclosed |
| 27 Jan 17 | K. McAllister Kyle McAllister |  St MirrenSTM | → | Derby CountyDER | Undisclosed |
| 25 Jan 17 | J. Hanson Jamie Hanson | Derby CountyDER | → |  Wigan AthleticWGA | Loan |
| 23 Jan 17 | C. Vernam Charles Vernam | Derby CountyDER | → |  Coventry CityCOV | Loan |
| 19 Jan 17 | A. Weimann Andreas Weimann | Derby CountyDER | → |  Wolverhampton WanderersWOL | Loan |
| 17 Jan 17 | F. Rawson Farrend Rawson | Derby CountyDER | → | Coventry CityCOV | Loan |
| 11 Jan 17 | C. Guy Callum Guy | Derby CountyDER | → |  Port ValeVALE | Loan |
| 09 Jan 17 | D. Nugent David Nugent | MiddlesbroughMID | → | Derby CountyDER | Undisclosed |
| 09 Jan 17 | D. Nugent David Nugent | MiddlesbroughMID | → | Derby CountyDER | Undisclosed |
| 05 Jan 17 | J. de Sart Julien de Sart | MiddlesbroughMID | → | Derby CountyDER | Loan |
| 05 Jan 17 | J. de Sart Julien de Sart | MiddlesbroughMID | → | Derby CountyDER | Loan |
| 04 Jan 17 | L. Grant Lee Grant | Derby CountyDER | → |  Stoke CitySTK | 1,300,000 |
| 04 Jan 17 | L. Grant Lee Grant | Derby CountyDER | → | Stoke CitySTK | 1,300,000 |