| 27 Aug 19 | C. MacDonald Calum MacDonald |  Derby CountyDER | → |  BlackpoolBLP | Undisclosed |
| 19 Aug 19 | G. Thorne George Thorne | Derby CountyDER | → |  Oxford UnitedOXF | Loan |
| 09 Aug 19 | K. McAllister Kyle McAllister | Derby CountyDER | → |  St MirrenSTM | Undisclosed |
| 09 Aug 19 | K. McAllister Kyle McAllister | Derby CountyDER | → | St MirrenSTM | Undisclosed |
| 08 Aug 19 | S. Carson Scott Carson | Derby CountyDER | → |  Manchester CityMNC | Loan |
| 08 Aug 19 | J. Paterson Jamie Paterson |  Bristol CityBRC | → | Derby CountyDER | Loan |
| 08 Aug 19 | B. Hamer Ben Hamer |  Huddersfield TownHUD | → | Derby CountyDER | Loan |
| 08 Aug 19 | S. Carson Scott Carson | Derby CountyDER | → | Manchester CityMNC | Loan |
| 02 Aug 19 | M. Clarke Matthew Clarke |  Brighton & Hove AlbionBHA | → | Derby CountyDER | Loan |
| 02 Aug 19 | K. Bielik Krystian Bielik |  ArsenalARS | → | Derby CountyDER | Undisclosed |
| 02 Aug 19 | M. Clarke Matthew Clarke | Brighton & Hove AlbionBHA | → | Derby CountyDER | Loan |
| 02 Aug 19 | K. Bielik Krystian Bielik | ArsenalARS | → | Derby CountyDER | Undisclosed |
| 30 Jul 19 | J. Butterfield Jacob Butterfield | Derby CountyDER | → |  Luton TownLUT | Free |
| 25 Jul 19 | K. Gordon Kellan Gordon | Derby CountyDER | → |  Mansfield TownMAN | Undisclosed |
| 18 Jul 19 | N. Blackman Nick Blackman | Derby CountyDER | → |  Maccabi Tel-AvivMTA | Free |
| 17 Jul 19 | D. Nugent David Nugent | Derby CountyDER | → |  Preston North EndPNE | Free |
| 11 Jul 19 | K. Dowell Kieran Dowell |  EvertonEVE | → | Derby CountyDER | Loan |
| 11 Jul 19 | K. Dowell Kieran Dowell | EvertonEVE | → | Derby CountyDER | Loan |
| 05 Jul 19 | B. Johnson Bradley Johnson | Derby CountyDER | → |  Blackburn RoversBLK | Free |
| 01 Jul 19 | G. Shinnie Graeme Shinnie |  AberdeenABER | → | Derby CountyDER | Free |
| 01 Jul 19 | C. Bryson Craig Bryson | Derby CountyDER | → | AberdeenABER | Free |
| 01 Jul 19 | C. Bryson Craig Bryson | Derby CountyDER | → | AberdeenABER | Free |
| 01 Jul 19 | G. Shinnie Graeme Shinnie | AberdeenABER | → | Derby CountyDER | Free |
| 13 Jun 19 | L. Thomas Luke Thomas | Derby CountyDER | → |  BarnsleyBAR | Undisclosed |
| 15 Feb 19 | E. Ambrose Efe Ambrose | XXX | → | Derby CountyDER | Free |
| 31 Jan 19 | A. King Andy King |  Leicester CityLEI | → | Derby CountyDER | Loan |
| 31 Jan 19 | A. King Andy King | Leicester CityLEI | → | Derby CountyDER | Loan |
| 25 Jan 19 | T. Elsnik Timi Max Elsnik | Derby CountyDER | → |  Northampton TownNHT | Loan |
| 21 Jan 19 | A. Cole Ashley Cole | XXX | → | Derby CountyDER | Free |
| 18 Jan 19 | K. McAllister Kyle McAllister | Derby CountyDER | → | St MirrenSTM | Loan |
| 18 Jan 19 | K. McAllister Kyle McAllister | Derby CountyDER | → | St MirrenSTM | Loan |
| 07 Jan 19 | G. Thorne George Thorne | Derby CountyDER | → | Luton TownLUT | Loan |
| 04 Jan 19 | A. Pearce Alex Pearce | Derby CountyDER | → |  MillwallMIL | Loan |