| 18 Nov 14 | G. Moncur George Moncur |  West Ham UnitedWHU | → |  Colchester UnitedCOL | Loan |
| 12 Nov 14 | Jamie Harney | West Ham UnitedWHU | → | Colchester UnitedCOL | Loan |
| 07 Nov 14 | D. Poyet Diego Poyet | West Ham UnitedWHU | → |  Huddersfield TownHUD | Loan |
| 07 Nov 14 | D. Poyet Diego Poyet | West Ham UnitedWHU | → | Huddersfield TownHUD | Loan |
| 31 Oct 14 | E. Lee Elliott Lee | West Ham UnitedWHU | → |  Southend UnitedSOUT | Loan |
| 24 Sept 14 | R. Morrison Ravel Morrison | West Ham UnitedWHU | → |  Cardiff CityCAR | Loan |
| 24 Sept 14 | R. Morrison Ravel Morrison | West Ham UnitedWHU | → | Cardiff CityCAR | Loan |
| 19 Sept 14 | S. Maguire Sean Maguire | West Ham UnitedWHU | → |  Accrington StanleyACCR | Loan |
| 11 Sept 14 | M. Fanimo Matthias Fanimo | West Ham UnitedWHU | → |  Tranmere RoversTRN | Loan |
| 01 Sept 14 | M. Amalfitano Morgan Amalfitano |  MarseilleMAR | → | West Ham UnitedWHU | Undisclosed |
| 01 Sept 14 | M. Amalfitano Morgan Amalfitano | MarseilleMAR | → | West Ham UnitedWHU | Undisclosed |
| 01 Sept 14 | M. Diamé Mohamed Diamé | West Ham UnitedWHU | → |  Hull CityHUL | Undisclosed |
| 30 Aug 14 | A. Song Alex Song |  BarcelonaBAR | → | West Ham UnitedWHU | Loan |
| 30 Aug 14 | A. Song Alex Song | BarcelonaBAR | → | West Ham UnitedWHU | Loan |
| 27 Aug 14 | M. Maïga Modibo Maïga | West Ham UnitedWHU | → |  MetzMETZ | Loan |
| 27 Aug 14 | M. Maïga Modibo Maïga | West Ham UnitedWHU | → | MetzMETZ | Loan |
| 14 Aug 14 | D. Sakho Diafra Sakho | MetzMETZ | → | West Ham UnitedWHU | Undisclosed |
| 14 Aug 14 | D. Sakho Diafra Sakho | MetzMETZ | → | West Ham UnitedWHU | Undisclosed |
| 07 Aug 14 | G. Moncur George Moncur | West Ham UnitedWHU | → | Colchester UnitedCOL | Loan |
| 31 Jul 14 | C. Jenkinson Carl Jenkinson |  ArsenalARS | → | West Ham UnitedWHU | Loan |
| 29 Jul 14 | E. Valencia Enner Valencia |  PachucaPAC | → | West Ham UnitedWHU | Undisclosed |
| 29 Jul 14 | E. Valencia Enner Valencia | PachucaPAC | → | West Ham UnitedWHU | Undisclosed |
| 21 Jul 14 | S. Henderson Stephen Henderson | West Ham UnitedWHU | → |  Charlton AthleticCHA | Free |
| 21 Jul 14 | S. Henderson Stephen Henderson | West Ham UnitedWHU | → | Charlton AthleticCHA | Free |
| 18 Jul 14 | Raphael Spiegel | West Ham UnitedWHU | → |  Crawley TownCRA | Loan |
| 08 Jul 14 | D. Poyet Diego Poyet | Charlton AthleticCHA | → | West Ham UnitedWHU | Undisclosed |
| 08 Jul 14 | D. Poyet Diego Poyet | Charlton AthleticCHA | → | West Ham UnitedWHU | Undisclosed |
| 04 Jul 14 | A. Robertson Andy Robertson |  Dundee UnitedDUN | → | West Ham UnitedWHU | Undisclosed |
| 04 Jul 14 | A. Robertson Andy Robertson | Dundee UnitedDUN | → | West Ham UnitedWHU | Undisclosed |
| 04 Jul 14 | M. Taylor Matthew Taylor | West Ham UnitedWHU | → |  BurnleyBUR | Free |
| 03 Jul 14 | A. Cresswell Aaron Cresswell |  Ipswich TownIPS | → | West Ham UnitedWHU | Undisclosed |
| 03 Jul 14 | A. Cresswell Aaron Cresswell | Ipswich TownIPS | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 14 | M. Zárate Mauro Zárate |  Vélez SarsfieldVEL | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 14 | J. Cole Joe Cole | West Ham UnitedWHU | → |  Aston VillaAVL | Free |
| 01 Jul 14 | M. Zárate Mauro Zárate | Vélez SarsfieldVEL | → | West Ham UnitedWHU | Undisclosed |
| 01 Jul 14 | C. Kouyaté Cheikhou Kouyaté |  AnderlechtAND | → | West Ham UnitedWHU | Undisclosed |
| 27 Mar 14 | B. Turgott Blair Turgott | West Ham UnitedWHU | → |  Dagenham & RedbridgeD&R | Loan |
| 18 Mar 14 | J. Collison Jack Collison | West Ham UnitedWHU | → |  Wigan AthleticWGA | Loan |
| 18 Mar 14 | J. Collison Jack Collison | West Ham UnitedWHU | → | Wigan AthleticWGA | Loan |
| 21 Feb 14 | R. Morrison Ravel Morrison | West Ham UnitedWHU | → |  Queens Park RangersQPR | Loan |
| 21 Feb 14 | R. Morrison Ravel Morrison | West Ham UnitedWHU | → | Queens Park RangersQPR | Loan |
| 31 Jan 14 | M. Maïga Modibo Maïga | West Ham UnitedWHU | → | Queens Park RangersQPR | Loan |
| 31 Jan 14 | P. Armero Pablo Armero |  NapoliNAP | → | West Ham UnitedWHU | Loan |
| 31 Jan 14 | M. Maïga Modibo Maïga | West Ham UnitedWHU | → | Queens Park RangersQPR | Loan |
| 31 Jan 14 | G. Moncur George Moncur | West Ham UnitedWHU | → |  Partick ThistlePAR | Loan |
| 31 Jan 14 | P. Armero Pablo Armero | NapoliNAP | → | West Ham UnitedWHU | Loan |
| 31 Jan 14 | G. Moncur George Moncur | West Ham UnitedWHU | → | Partick ThistlePAR | Loan |
| 30 Jan 14 | P. McCallum Paul McCallum | West Ham UnitedWHU | → |  Heart of MidlothianHOM | Loan |
| 30 Jan 14 | A. Razak Abdul Razak |  Anzhi MakhachkalaANZ | → | West Ham UnitedWHU | Undisclosed |
| 30 Jan 14 | P. McCallum Paul McCallum | West Ham UnitedWHU | → | Heart of MidlothianHOM | Loan |
| 30 Jan 14 | J. Spence Jordan Spence | West Ham UnitedWHU | → |  Milton Keynes DonsMKD | Loan |
| 28 Jan 14 | P. Mpanzu Pelly-Ruddock Mpanzu | West Ham UnitedWHU | → |  Luton TownLUT | Undisclosed |
| 25 Jan 14 | A. Nocerino Antonio Nocerino |  AC MilanMIL | → | West Ham UnitedWHU | Loan |
| 25 Jan 14 | A. Nocerino Antonio Nocerino | AC MilanMIL | → | West Ham UnitedWHU | Loan |
| 25 Jan 14 | M. Borriello Marco Borriello |  AS RomaROMA | → | West Ham UnitedWHU | Loan |
| 25 Jan 14 | M. Borriello Marco Borriello | AS RomaROMA | → | West Ham UnitedWHU | Loan |
| 17 Jan 14 | B. Turgott Blair Turgott | West Ham UnitedWHU | → |  Rotherham UnitedROT | Loan |
| 06 Jan 14 | R. Johnson Roger Johnson |  Wolverhampton WanderersWOL | → | West Ham UnitedWHU | Loan |
| 01 Jan 14 | J. Gordon Jaanai Gordon |  Peterborough UnitedPET | → | West Ham UnitedWHU | Undisclosed |