| 22 Nov 12 | V. Gjokaj Valentin Gjokaj |  Derby CountyDER | → |  Carlisle UnitedCAR | Loan |
| 16 Nov 12 | T. Naylor Tom Naylor | Derby CountyDER | → |  Bradford CityBRD | Loan |
| 25 Sept 12 | J. Bailey James Bailey | Derby CountyDER | → |  Coventry CityCOV | Loan |
| 22 Aug 12 | K. Freeman Kieran Freeman |  Nottingham ForestFOR | → | Derby CountyDER | Undisclosed |
| 20 Aug 12 | S. Davies Steve Davies | Derby CountyDER | → |  Bristol CityBRC | Undisclosed |
| 20 Aug 12 | C. Sammon Conor Sammon |  Wigan AthleticWGA | → | Derby CountyDER | Undisclosed |
| 20 Aug 12 | C. Sammon Conor Sammon | Wigan AthleticWGA | → | Derby CountyDER | Undisclosed |
| 07 Aug 12 | Michael Hoganson | XXX | → | Derby CountyDER | Free |
| 01 Aug 12 | J. O'Connor James O'Connor |  Doncaster RoversDON | → | Derby CountyDER | Undisclosed |
| 27 Jul 12 | R. Atkins Ross Atkins | Derby CountyDER | → |  Burton AlbionBRT | Loan |
| 19 Jul 12 | C. Ball Callum Ball | Derby CountyDER | → | Coventry CityCOV | Loan |
| 19 Jul 12 | R. Keogh Richard Keogh | Coventry CityCOV | → | Derby CountyDER | Undisclosed |
| 14 Jul 12 | P. Coutts Paul Coutts |  Preston North EndPNE | → | Derby CountyDER | Undisclosed |
| 12 Jul 12 | M. Addison Miles Addison | Derby CountyDER | → |  AFC BournemouthBOU | Undisclosed |
| 05 Jul 12 | J. Shackell Jason Shackell | Derby CountyDER | → |  BurnleyBUR | Undisclosed |
| 03 Jul 12 | L. Croft Lee Croft | Derby CountyDER | → |  Oldham AthleticOLD | Loan |
| 01 Jul 12 | M. Jacobs Michael Jacobs |  Northampton TownNHT | → | Derby CountyDER | Undisclosed |
| 01 Jul 12 | P. Green Paul Green | Derby CountyDER | → |  Leeds UnitedLEE | Free |
| 01 Jul 12 | J. Severn James Severn | Derby CountyDER | → |  Scunthorpe UnitedSCU | Free |
| 21 Jun 12 | C. Maguire Christopher Maguire | Derby CountyDER | → |  Sheffield WednesdaySHW | Undisclosed |
| 20 Mar 12 | A. Legzdins Adam Legzdins | Derby CountyDER | → | Burton AlbionBRT | Loan |
| 09 Mar 12 | C. Maguire Christopher Maguire | Derby CountyDER | → |  PortsmouthPOR | Loan |
| 24 Feb 12 | M. Addison Miles Addison | Derby CountyDER | → | AFC BournemouthBOU | Loan |
| 30 Jan 12 | T. Carroll Thomas Carroll |  Tottenham HotspurTOT | → | Derby CountyDER | Loan |
| 30 Jan 12 | T. Carroll Thomas Carroll | Tottenham HotspurTOT | → | Derby CountyDER | Loan |
| 26 Jan 12 | T. Cywka Tomasz Cywka | Derby CountyDER | → |  ReadingREA | Free |
| 19 Jan 12 | L. Croft Lee Croft | Derby CountyDER | → |  St JohnstoneSTJO | Loan |
| 19 Jan 12 | L. Croft Lee Croft | Derby CountyDER | → | St JohnstoneSTJO | Loan |
| 18 Jan 12 | R. Noble Ryan Noble |  SunderlandSUN | → | Derby CountyDER | Loan |
| 18 Jan 12 | R. Noble Ryan Noble | SunderlandSUN | → | Derby CountyDER | Loan |
| 17 Jan 12 | R. Anderson Russell Anderson | Derby CountyDER | → |  AberdeenABER | Free |
| 17 Jan 12 | R. Anderson Russell Anderson | Derby CountyDER | → | AberdeenABER | Free |
| 14 Jan 12 | D. Leacock Dean Leacock | Derby CountyDER | → |  Leyton OrientLEY | Free |
| 06 Jan 12 | S. Pearson Stephen Pearson | Derby CountyDER | → | Bristol CityBRC | Free |
| 04 Jan 12 | D. Martin David Martin | Derby CountyDER | → |  Southend UnitedSOUT | Undisclosed |
| 02 Jan 12 | T. Naylor Tom Naylor |  Mansfield TownMAN | → | Derby CountyDER | Undisclosed |
| 01 Jan 12 | S. Bywater Stephen Bywater | Derby CountyDER | → | Sheffield WednesdaySHW | Free |