| 27 Nov 08 | J. Walker James Walker |  West Ham UnitedWHU | → |  Colchester UnitedCOL | Loan |
| 27 Nov 08 | K. Reid Kyel Reid | West Ham UnitedWHU | → |  BlackpoolBLP | Loan |
| 27 Nov 08 | J. Tomkins James Tomkins | West Ham UnitedWHU | → |  Derby CountyDER | Loan |
| 27 Nov 08 | K. Reid Kyel Reid | West Ham UnitedWHU | → | BlackpoolBLP | Loan |
| 27 Nov 08 | J. Tomkins James Tomkins | West Ham UnitedWHU | → | Derby CountyDER | Loan |
| 27 Nov 08 | J. Stanislas Junior Stanislas | West Ham UnitedWHU | → |  Southend UnitedSOUT | Loan |
| 25 Nov 08 | J. Spence Jordan Spence | West Ham UnitedWHU | → |  Leyton OrientLEY | Loan |
| 13 Nov 08 | B. Ngala Bondz Ngala | West Ham UnitedWHU | → |  Milton Keynes DonsMKD | Loan |
| 21 Oct 08 | N. Quashie Nigel Quashie | West Ham UnitedWHU | → |  Birmingham CityBIR | Loan |
| 21 Oct 08 | N. Quashie Nigel Quashie | West Ham UnitedWHU | → | Birmingham CityBIR | Loan |
| 14 Oct 08 | D. Tristan Diego Tristán | XXX | → | West Ham UnitedWHU | Free |
| 24 Sept 08 | J. Payne Josh Payne | West Ham UnitedWHU | → |  Cheltenham TownCHL | Loan |
| 12 Sept 08 | J. Jeffrey Jack Jeffrey | West Ham UnitedWHU | → | Leyton OrientLEY | Loan |
| 05 Sept 08 | W. Lopez Walter Lopez | XXX | → | West Ham UnitedWHU | Free |
| 01 Sept 08 | D. Di Michele David Di Michele |  TorinoTOR | → | West Ham UnitedWHU | Loan |
| 01 Sept 08 | H. Ilunga Herita Nkongolo Ilunga |  ToulouseTOUL | → | West Ham UnitedWHU | Loan |
| 01 Sept 08 | H. Ilunga Herita Nkongolo Ilunga | ToulouseTOUL | → | West Ham UnitedWHU | Loan |
| 01 Sept 08 | D. Di Michele David Di Michele | TorinoTOR | → | West Ham UnitedWHU | Loan |
| 01 Sept 08 | G. McCartney George McCartney | West Ham UnitedWHU | → |  SunderlandSUN | Undisclosed |
| 01 Sept 08 | B. Bajner Balint Bajner | LOXLiberty OradeaLiberty Oradea | → | West Ham UnitedWHU | Loan |
| 27 Aug 08 | A. Ferdinand Anton Ferdinand | West Ham UnitedWHU | → | SunderlandSUN | Undisclosed |
| 04 Aug 08 | J. Lastuvka Jan Lastuvka | SDXShakhtar DonetskShakhtar Donetsk | → | West Ham UnitedWHU | Loan |
| 04 Aug 08 | G. Grasser Georg Grasser | GAXGrazer AKGrazer AK | → | West Ham UnitedWHU | Undisclosed |
| 23 Jul 08 | V. Behrami Valon Behrami |  LazioLAZ | → | West Ham UnitedWHU | 5000000 |
| 23 Jul 08 | V. Behrami Valon Behrami | LazioLAZ | → | West Ham UnitedWHU | 5000000 |
| 21 Jul 08 | R. Wright Richard Wright | West Ham UnitedWHU | → |  Ipswich TownIPS | Undisclosed |
| 21 Jul 08 | R. Wright Richard Wright | West Ham UnitedWHU | → | Ipswich TownIPS | Undisclosed |
| 15 Jul 08 | B. Zamora Bobby Zamora | West Ham UnitedWHU | → |  FulhamFUL | 6,300,000 |
| 04 Jul 08 | H. Eyjolffson Holmar Orn Eyjolffson | HKXHK KopavogurHK Kopavogur | → | West Ham UnitedWHU | Undisclosed |
| 03 Jul 08 | B. Hunt Ben Hunt | West Ham UnitedWHU | → |  Bristol RoversBRI | Free |
| 27 Mar 08 | K. Reid Kyel Reid | West Ham UnitedWHU | → |  Crystal PalaceCRY | Loan |
| 27 Mar 08 | Z. Hines Zavon Hines | West Ham UnitedWHU | → |  Coventry CityCOV | Loan |
| 27 Mar 08 | K. Reid Kyel Reid | West Ham UnitedWHU | → | Crystal PalaceCRY | Loan |
| 27 Mar 08 | Z. Hines Zavon Hines | West Ham UnitedWHU | → | Coventry CityCOV | Loan |
| 20 Mar 08 | R. Wright Richard Wright | West Ham UnitedWHU | → |  SouthamptonSOU | Loan |
| 20 Mar 08 | R. Wright Richard Wright | West Ham UnitedWHU | → | SouthamptonSOU | Loan |
| 14 Feb 08 | Joe Widdowson | West Ham UnitedWHU | → |  Rotherham UnitedROT | Loan |
| 30 Jan 08 | C. Dailly Christian Dailly | West Ham UnitedWHU | → |  RangersRAN | Free |
| 30 Jan 08 | C. Dailly Christian Dailly | West Ham UnitedWHU | → | RangersRAN | Free |
| 18 Jan 08 | C. Davenport Calum Davenport | West Ham UnitedWHU | → |  WatfordWAT | Loan |
| 18 Jan 08 | C. Davenport Calum Davenport | West Ham UnitedWHU | → | WatfordWAT | Loan |
| 11 Jan 08 | D. Medjedovic Dino Medjedovic | West Ham UnitedWHU | → |  WeymouthWEY | Loan |
| 02 Jan 08 | H. Ephraim Hogan Ephraim | West Ham UnitedWHU | → |  Queens Park RangersQPR | Undisclosed |
| 02 Jan 08 | H. Ephraim Hogan Ephraim | West Ham UnitedWHU | → | Queens Park RangersQPR | Undisclosed |