| 26 Nov 15 | E. Lee Elliott Lee |  West Ham UnitedWHU | → |  BlackpoolBLP | Loan |
| 24 Nov 15 | D. Henry Doneil Henry | West Ham UnitedWHU | → |  Blackburn RoversBLK | Loan |
| 24 Nov 15 | D. Henry Doneil Henry | West Ham UnitedWHU | → | Blackburn RoversBLK | Loan |
| 24 Nov 15 | M. Samuelsen Martin Samuelsen | West Ham UnitedWHU | → |  Peterborough UnitedPET | Loan |
| 01 Sept 15 | A. Song Alex Song |  BarcelonaBAR | → | West Ham UnitedWHU | Loan |
| 01 Sept 15 | M. Antonio Michail Antonio |  Nottingham ForestFOR | → | West Ham UnitedWHU | Undisclosed |
| 01 Sept 15 | N. Jelavic Nikica Jelavic |  Hull CityHUL | → | West Ham UnitedWHU | Undisclosed |
| 01 Sept 15 | M. Jarvis Matthew Jarvis | West Ham UnitedWHU | → |  Norwich CityNOR | Loan |
| 01 Sept 15 | V. Moses Victor Moses |  ChelseaCHE | → | West Ham UnitedWHU | Loan |
| 01 Sept 15 | A. Song Alex Song | BarcelonaBAR | → | West Ham UnitedWHU | Loan |
| 01 Sept 15 | N. Jelavic Nikica Jelavic | Hull CityHUL | → | West Ham UnitedWHU | Undisclosed |
| 01 Sept 15 | M. Antonio Michail Antonio | Nottingham ForestFOR | → | West Ham UnitedWHU | Undisclosed |
| 31 Aug 15 | M. Maïga Modibo Maïga | West Ham UnitedWHU | → | ANXAl NassrAl Nassr | Undisclosed |
| 20 Aug 15 | R. Burke Reece Burke | West Ham UnitedWHU | → |  Bradford CityBRD | Loan |
| 19 Aug 15 | D. Poyet Diego Poyet | West Ham UnitedWHU | → |  Milton Keynes DonsMKD | Loan |
| 19 Aug 15 | D. Poyet Diego Poyet | West Ham UnitedWHU | → | Milton Keynes DonsMKD | Loan |
| 22 Jul 15 | M. Lanzini Manuel Lanzini | AXXAl-JaziraAl-Jazira | → | West Ham UnitedWHU | Loan |
| 16 Jul 15 | S. Downing Stewart Downing | West Ham UnitedWHU | → |  MiddlesbroughMID | Undisclosed |
| 16 Jul 15 | S. Downing Stewart Downing | West Ham UnitedWHU | → | MiddlesbroughMID | Undisclosed |
| 14 Jul 15 | C. Jenkinson Carl Jenkinson |  ArsenalARS | → | West Ham UnitedWHU | Loan |
| 10 Jul 15 | A. Ogbonna Angelo Ogbonna |  JuventusJUV | → | West Ham UnitedWHU | Undisclosed |
| 10 Jul 15 | A. Ogbonna Angelo Ogbonna | JuventusJUV | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 15 | P. Obiang Pedro Obiang |  SampdoriaSAM | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 15 | S. Hendrie Stephen Hendrie |  Hamilton AcademicalHAM | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 15 | P. Obiang Pedro Obiang | SampdoriaSAM | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 15 | D. Payet Dimitri Payet |  MarseilleMAR | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 15 | R. Morrison Ravel Morrison | West Ham UnitedWHU | → |  LazioLAZ | Free |
| 01 Jul 15 | D. Randolph Darren Randolph |  Birmingham CityBIR | → | West Ham UnitedWHU | Free |
| 01 Jul 15 | D. Randolph Darren Randolph | Birmingham CityBIR | → | West Ham UnitedWHU | Free |
| 01 Jul 15 | R. Morrison Ravel Morrison | West Ham UnitedWHU | → | LazioLAZ | Free |
| 01 Jul 15 | D. Payet Dimitri Payet | MarseilleMAR | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 15 | S. Hendrie Stephen Hendrie | Hamilton AcademicalHAM | → | West Ham UnitedWHU | Undisclosed |
| 08 May 15 | S. Lletget Sebastian Lletget | West Ham UnitedWHU | → |  LA GalaxyLA | Free |
| 08 May 15 | S. Lletget Sebastian Lletget | West Ham UnitedWHU | → | LA GalaxyLA | Free |
| 21 Feb 15 | R. Spiegel Raphael Spiegel | West Ham UnitedWHU | → |  Carlisle UnitedCAR | Loan |
| 19 Feb 15 | E. Lee Elliott Lee | West Ham UnitedWHU | → |  Luton TownLUT | Loan |
| 18 Feb 15 | Nenê | XXX | → | West Ham UnitedWHU | Free |
| 02 Feb 15 | B. Turgott Blair Turgott | West Ham UnitedWHU | → |  Coventry CityCOV | Free |
| 28 Jan 15 | J. Harney Jamie Harney | West Ham UnitedWHU | → |  Colchester UnitedCOL | Free |
| 24 Jan 15 | S. Maguire Sean Maguire | West Ham UnitedWHU | → |  Accrington StanleyACCR | Loan |
| 15 Jan 15 | P. McCallum Paul McCallum | West Ham UnitedWHU | → |  PortsmouthPOR | Loan |
| 06 Jan 15 | M. Zárate Mauro Zárate | West Ham UnitedWHU | → |  Queens Park RangersQPR | Loan |
| 03 Jan 15 | D. Henry Doneil Henry | ALXApollon LimassolApollon Limassol | → | West Ham UnitedWHU | Undisclosed |