| 26 Nov 09 | T. Kallio Toni Kallio |  FulhamFUL | → |  Sheffield UnitedSHU | Loan |
| 26 Nov 09 | T. Kallio Toni Kallio | FulhamFUL | → | Sheffield UnitedSHU | Loan |
| 26 Nov 09 | C. Ikeme Carl Ikeme |  Wolverhampton WanderersWOL | → | Sheffield UnitedSHU | Loan |
| 26 Nov 09 | C. Ikeme Carl Ikeme | Wolverhampton WanderersWOL | → | Sheffield UnitedSHU | Loan |
| 24 Nov 09 | D. Cotterill David Cotterill | Sheffield UnitedSHU | → |  Swansea CitySWA | Loan |
| 22 Oct 09 | H. Camara Henri Camara | XXX | → | Sheffield UnitedSHU | Free |
| 29 Sept 09 | R. Cresswell Richard Cresswell |  Stoke CitySTK | → | Sheffield UnitedSHU | Loan |
| 29 Sept 09 | R. Cresswell Richard Cresswell | Stoke CitySTK | → | Sheffield UnitedSHU | Loan |
| 25 Sept 09 | J. Fortune Jonathan Fortune | XXX | → | Sheffield UnitedSHU | Free |
| 18 Sept 09 | J. Fortune Jonathan Fortune | XXX | → | Sheffield UnitedSHU | Free |
| 18 Sept 09 | A. Davies Andrew Davies | Stoke CitySTK | → | Sheffield UnitedSHU | Loan |
| 18 Sept 09 | A. Davies Andrew Davies | Stoke CitySTK | → | Sheffield UnitedSHU | Loan |
| 01 Sept 09 | B. Sharp Billy Sharp | Sheffield UnitedSHU | → |  Doncaster RoversDON | Loan |
| 01 Sept 09 | J. Stewart Jordan Stewart |  Derby CountyDER | → | Sheffield UnitedSHU | Free |
| 01 Sept 09 | L. Hendrie Lee Hendrie | Sheffield UnitedSHU | → | Derby CountyDER | Free |
| 01 Sept 09 | L. Bromby Leigh Bromby | Sheffield UnitedSHU | → |  Leeds UnitedLEE | Undisclosed |
| 01 Sept 09 | B. Howard Brian Howard | Sheffield UnitedSHU | → |  ReadingREA | Undisclosed |
| 01 Sept 09 | J. Harper James Harper | ReadingREA | → | Sheffield UnitedSHU | Loan |
| 31 Aug 09 | D. Carney David Carney | Sheffield UnitedSHU | → |  FC TwenteTWE | Undisclosed |
| 31 Aug 09 | D. Carney David Carney | Sheffield UnitedSHU | → | FC TwenteTWE | Undisclosed |
| 27 Aug 09 | J. Haber Justin Haber | Sheffield UnitedSHU | → | FXXFerencvarosFerencvaros | Free |
| 14 Aug 09 | J. Roberts Jordan Roberts | Sheffield UnitedSHU | → |  BuryBURY | Loan |
| 05 Aug 09 | G. Little Glen Little | XXX | → | Sheffield UnitedSHU | Free |
| 05 Aug 09 | K. Walker Kyle Walker |  Tottenham HotspurTOT | → | Sheffield UnitedSHU | Loan |
| 05 Aug 09 | K. Walker Kyle Walker | Tottenham HotspurTOT | → | Sheffield UnitedSHU | Loan |
| 03 Aug 09 | M. Bunn Mark Bunn |  Blackburn RoversBLK | → | Sheffield UnitedSHU | Loan |
| 03 Aug 09 | M. Bunn Mark Bunn | Blackburn RoversBLK | → | Sheffield UnitedSHU | Loan |
| 01 Aug 09 | N. Travis Nicky Travis | Sheffield UnitedSHU | → |  Central Coast MarinersCCM | Free |
| 01 Aug 09 | N. Travis Nicky Travis | Sheffield UnitedSHU | → | Central Coast MarinersCCM | Free |
| 24 Jul 09 | C. Evans Ched Evans |  Manchester CityMNC | → | Sheffield UnitedSHU | 3000000 |
| 24 Jul 09 | K. Treacy Keith Treacy | Blackburn RoversBLK | → | Sheffield UnitedSHU | Loan |
| 24 Jul 09 | K. Treacy Keith Treacy | Blackburn RoversBLK | → | Sheffield UnitedSHU | Loan |
| 24 Jul 09 | R. France Ryan France | XXX | → | Sheffield UnitedSHU | Free |
| 24 Jul 09 | C. Evans Ched Evans | Manchester CityMNC | → | Sheffield UnitedSHU | 3000000 |
| 22 Jul 09 | K. Walker Kyle Walker | Sheffield UnitedSHU | → | Tottenham HotspurTOT | Undisclosed |
| 22 Jul 09 | K. Naughton Kyle Naughton | Sheffield UnitedSHU | → | Tottenham HotspurTOT | Undisclosed |
| 22 Jul 09 | K. Walker Kyle Walker | Sheffield UnitedSHU | → | Tottenham HotspurTOT | Undisclosed |
| 22 Jul 09 | K. Naughton Kyle Naughton | Sheffield UnitedSHU | → | Tottenham HotspurTOT | Undisclosed |
| 15 Jul 09 | A. Taylor Andy Taylor |  Tranmere RoversTRN | → | Sheffield UnitedSHU | Undisclosed |
| 01 Jul 09 | K. Reid Kyel Reid |  West Ham UnitedWHU | → | Sheffield UnitedSHU | Free |
| 01 Jul 09 | K. Reid Kyel Reid | West Ham UnitedWHU | → | Sheffield UnitedSHU | Free |
| 01 Jul 09 | J. Annerson Jamie Annerson | Sheffield UnitedSHU | → |  Rotherham UnitedROT | Free |
| 18 Jun 09 | L. Williamson Lee Williamson |  WatfordWAT | → | Sheffield UnitedSHU | Undisclosed |
| 29 May 09 | A. Chapman Adam Chapman | Sheffield UnitedSHU | → |  Oxford UnitedOXF | Undisclosed |
| 25 Feb 09 | J. O'Toole John-Joe O'Toole | WatfordWAT | → | Sheffield UnitedSHU | Loan |
| 20 Feb 09 | C. Beattie Craig Beattie |  West Bromwich AlbionWBA | → | Sheffield UnitedSHU | Loan |
| 20 Feb 09 | C. Beattie Craig Beattie | West Bromwich AlbionWBA | → | Sheffield UnitedSHU | Loan |
| 02 Feb 09 | A. Lupoli Arturo Lupoli |  FiorentinaFIO | → | Sheffield UnitedSHU | Loan |
| 02 Feb 09 | A. Lupoli Arturo Lupoli | FiorentinaFIO | → | Sheffield UnitedSHU | Loan |
| 29 Jan 09 | D. Carney David Carney | Sheffield UnitedSHU | → |  Norwich CityNOR | Loan |
| 19 Jan 09 | J. Ward Jamie Ward |  ChesterfieldCHES | → | Sheffield UnitedSHU | 330000 |
| 12 Jan 09 | J. Beattie James Beattie | Sheffield UnitedSHU | → | Stoke CitySTK | Undisclosed |
| 12 Jan 09 | L. Bromby Leigh Bromby | WatfordWAT | → | Sheffield UnitedSHU | Loan |
| 12 Jan 09 | J. Beattie James Beattie | Sheffield UnitedSHU | → | Stoke CitySTK | Undisclosed |
| 07 Jan 09 | B. Howard Brian Howard |  BarnsleyBAR | → | Sheffield UnitedSHU | Undisclosed |
| 02 Jan 09 | A. Chapman Adam Chapman | Sheffield UnitedSHU | → | Oxford UnitedOXF | Loan |