| 28 Nov 13 | B. Turgott Blair Turgott |  West Ham UnitedWHU | → |  Colchester UnitedCOL | Loan |
| 20 Nov 13 | D. Potts Daniel Potts | West Ham UnitedWHU | → |  PortsmouthPOR | Loan |
| 24 Oct 13 | J. Spence Jordan Spence | West Ham UnitedWHU | → |  Milton Keynes DonsMKD | Loan |
| 22 Oct 13 | E. Lee Elliott Lee | West Ham UnitedWHU | → | Colchester UnitedCOL | Loan |
| 22 Oct 13 | P. McCallum Paul McCallum | West Ham UnitedWHU | → |  Torquay UnitedTQU | Loan |
| 14 Oct 13 | C. Cole Carlton Cole | XXX | → | West Ham UnitedWHU | Free |
| 03 Oct 13 | S. Henderson Stephen Henderson | West Ham UnitedWHU | → |  AFC BournemouthBOU | Loan |
| 03 Oct 13 | S. Henderson Stephen Henderson | West Ham UnitedWHU | → | AFC BournemouthBOU | Loan |
| 01 Oct 13 | J. Collison Jack Collison | West Ham UnitedWHU | → | AFC BournemouthBOU | Loan |
| 01 Oct 13 | J. Collison Jack Collison | West Ham UnitedWHU | → | AFC BournemouthBOU | Loan |
| 10 Sept 13 | M. Petric Mladen Petric | XXX | → | West Ham UnitedWHU | Free |
| 31 Aug 13 | J. Spence Jordan Spence | West Ham UnitedWHU | → |  Sheffield WednesdaySHW | Loan |
| 31 Aug 13 | J. Spence Jordan Spence | West Ham UnitedWHU | → | Sheffield WednesdaySHW | Loan |
| 13 Aug 13 | S. Downing Stewart Downing |  LiverpoolLIV | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 13 | Adrián |  Real BetisBET | → | West Ham UnitedWHU | Free |
| 01 Jul 13 | Adrián | Real BetisBET | → | West Ham UnitedWHU | Free |
| 01 Jul 13 | R. Rat Razvan Rat | SDXShakhtar DonetskShakhtar Donetsk | → | West Ham UnitedWHU | Free |
| 01 Jul 13 | R. Hall Robert Hall | West Ham UnitedWHU | → |  Bolton WanderersBOL | Free |
| 01 Jul 13 | R. Hall Robert Hall | West Ham UnitedWHU | → | Bolton WanderersBOL | Free |
| 20 Jun 13 | D. Whitehead Danny Whitehead |  Stockport CountySTO | → | West Ham UnitedWHU | Undisclosed |
| 19 Jun 13 | A. Carroll Andy Carroll | LiverpoolLIV | → | West Ham UnitedWHU | Undisclosed |
| 28 Mar 13 | R. Hall Robert Hall | West Ham UnitedWHU | → | Bolton WanderersBOL | Loan |
| 28 Mar 13 | R. Hall Robert Hall | West Ham UnitedWHU | → | Bolton WanderersBOL | Loan |
| 08 Mar 13 | P. McCallum Paul McCallum | West Ham UnitedWHU | → |  Aldershot TownALD | Loan |
| 28 Feb 13 | F. Piquionne Frédéric Piquionne | West Ham UnitedWHU | → |  Portland TimbersPOR | Free |
| 28 Feb 13 | F. Piquionne Frédéric Piquionne | West Ham UnitedWHU | → | Portland TimbersPOR | Free |
| 31 Jan 13 | A. Diarra Alou Diarra | West Ham UnitedWHU | → |  Stade RennaisREN | Loan |
| 31 Jan 13 | A. Diarra Alou Diarra | West Ham UnitedWHU | → | Stade RennaisREN | Loan |
| 28 Jan 13 | E. Pogatetz Emanuel Pogatetz |  VfL WolfsburgWOB | → | West Ham UnitedWHU | Loan |
| 28 Jan 13 | E. Pogatetz Emanuel Pogatetz | VfL WolfsburgWOB | → | West Ham UnitedWHU | Loan |
| 11 Jan 13 | W. Paulista Wellington Paulista |  CruzeiroCRU | → | West Ham UnitedWHU | Loan |
| 11 Jan 13 | W. Paulista Wellington Paulista | CruzeiroCRU | → | West Ham UnitedWHU | Loan |
| 04 Jan 13 | M. Chamakh Marouane Chamakh |  ArsenalARS | → | West Ham UnitedWHU | Loan |
| 04 Jan 13 | J. Cole Joe Cole | LiverpoolLIV | → | West Ham UnitedWHU | Free |
| 03 Jan 13 | Sean Maguire | WXXWaterfordWaterford | → | West Ham UnitedWHU | Undisclosed |