| 31 Aug 24 | K. Zouma Kurt Zouma |  West Ham UnitedWHU | → | AOXAl OrobahORO | Loan |
| 30 Aug 24 | J. Ward-Prowse James Ward-Prowse | West Ham UnitedWHU | → |  Nottingham ForestNFO | Loan |
| 30 Aug 24 | M. Cornet Maxwel Cornet | West Ham UnitedWHU | → |  SouthamptonSOU | Loan |
| 30 Aug 24 | C. Soler Carlos Soler |  Paris Saint-GermainPSG | → | West Ham UnitedWHU | Loan |
| 30 Aug 24 | N. Aguerd Nayef Aguerd | West Ham UnitedWHU | → |  Real SociedadRSO | Loan |
| 26 Aug 24 | F. Potts Freddie Potts | West Ham UnitedWHU | → |  PortsmouthPOR | Loan |
| 14 Aug 24 | G. Earthy George Earthy | West Ham UnitedWHU | → |  Bristol CityBRC | Loan |
| 13 Aug 24 | A. Wan-Bissaka Aaron Wan-Bissaka |  Manchester UnitedMAN | → | West Ham UnitedWHU | Undisclosed |
| 10 Aug 24 | J. Todibo Jean-Clair Todibo |  NiceNICE | → | West Ham UnitedWHU | Loan |
| 09 Aug 24 | C. Marshall Callum Marshall | West Ham UnitedWHU | → |  Huddersfield TownHUD | Loan |
| 08 Aug 24 | P. Kelly Patrick Kelly | West Ham UnitedWHU | → |  Doncaster RoversDON | Loan |
| 06 Aug 24 | G. Rodríguez Guido Rodríguez |  Real BetisBET | → | West Ham UnitedWHU | Free |
| 05 Aug 24 | N. Füllkrug Niclas Füllkrug |  Borussia DortmundDOR | → | West Ham UnitedWHU | Undisclosed |
| 03 Aug 24 | C. Summerville Crysencio Summerville |  Leeds UnitedLEE | → | West Ham UnitedWHU | Undisclosed |
| 26 Jul 24 | L. Laing Levi Laing | West Ham UnitedWHU | → |  Cheltenham TownCHL | Loan |
| 16 Jul 24 | F. Downes Flynn Downes | West Ham UnitedWHU | → | SouthamptonSOU | Undisclosed |
| 06 Jul 24 | M. Kilman Max Kilman |  Wolverhampton WanderersWOL | → | West Ham UnitedWHU | Undisclosed |
| 05 Jul 24 | M. Forbes Michael Forbes | West Ham UnitedWHU | → |  Bristol RoversBRI | Loan |
| 01 Jul 24 | S. Benrahma Saïd Benrahma | West Ham UnitedWHU | → |  LyonLYON | 12300000 |
| 01 Jul 24 | B. Johnson Ben Johnson | West Ham UnitedWHU | → |  Ipswich TownIPS | Free |
| 01 Jul 24 | W. Foderingham Wes Foderingham |  Sheffield UnitedSHU | → | West Ham UnitedWHU | Free |
| 01 Jul 24 | T. Kehrer Thilo Kehrer | West Ham UnitedWHU | → |  AS MonacoMON | Undisclosed |
| 01 Jul 24 | L. Lira Dos Santos Luis Guilherme |  PalmeirasPAL | → | West Ham UnitedWHU | Undisclosed |
| 22 Jun 24 | N. Trott Nathan Trott | West Ham UnitedWHU | → |  F.C. KøbenhavnKBH | Undisclosed |
| 01 Feb 24 | D. Chesters Daniel Chesters | West Ham UnitedWHU | → |  Salford CitySAL | Loan |
| 01 Feb 24 | P. Fornals Pablo Fornals | West Ham UnitedWHU | → | Real BetisBET | Undisclosed |
| 26 Jan 24 | K. Phillips Kalvin Phillips |  Manchester CityMNC | → | West Ham UnitedWHU | Loan |
| 12 Jan 24 | G. Kodua Gideon Kodua | West Ham UnitedWHU | → |  Wycombe WanderersWYC | Loan |
| 12 Jan 24 | C. Coventry Conor Coventry | West Ham UnitedWHU | → |  Charlton AthleticCHA | Undisclosed |