Dir | ||||||
|---|---|---|---|---|---|---|
| 2/2/2026 | Loan | Chelsea | West Ham UtdUntil 6/30/2026 | Defender | ||
| 1/28/2026 | Transfer | West Ham Utd | Flamengo | Midfielder | ||
 🏴James Ward-Prowse | 1/28/2026 | Loan | West Ham Utd | BurnleyUntil 6/30/2026 | Midfielder | |
| 1/28/2026 | Transfer | Fulham | West Ham UtdUntil 7/1/2026 | Forward | ||
| 1/27/2026 | Back from Loan | West Ham Utd | Brighton | Defender | ||
| 1/26/2026 | Transfer | West Ham Utd | Valencia | Midfielder | ||
| 1/22/2026 | Loan | Deportivo La Guaira | West Ham UtdUntil 6/30/2026 | Forward | ||
 🏴Andrew Irving | 1/18/2026 | Transfer | West Ham Utd | Sparta Praha | Midfielder | |
🏴Kaelan Casey | 1/16/2026 | Loan | West Ham Utd | Leyton OrientUntil 6/30/2026 | Defender | |
🏴Kaelan Casey | 1/15/2026 | Back from Loan | Swansea City | West Ham UtdUntil 1/16/2026 | Defender | |
| 1/7/2026 | Loan | West Ham Utd | BochumUntil 6/30/2026 | Forward | ||
| 1/5/2026 | Transfer | Lazio | West Ham Utd | Forward | ||
| 1/4/2026 | Transfer | West Ham Utd | Sporting CP | Forward | ||
| 1/2/2026 | Loan | West Ham Utd | MilanUntil 6/30/2026 | Forward | ||
| 1/2/2026 | Transfer | Gil Vicente | West Ham Utd | Forward | ||
| 9/10/2025 | Free Transfer | Unknown | West Ham UtdUntil 7/1/2026 | Goalkeeper | ||
 🏴Wes Foderingham | 9/9/2025 | Transfer | West Ham Utd | Aris | Goalkeeper | |
| 9/3/2025 | Transfer | West Ham Utd | CFR ClujUntil 1/10/2026 | Defender | ||
| 9/1/2025 | Loan | West Ham Utd | GenoaUntil 6/30/2026 | Forward | ||
| 9/1/2025 | Transfer | West Ham Utd | Olympique Marseille | Defender | ||
| 9/1/2025 | Transfer | West Ham Utd | Olympique Marseille | Defender | ||
| 9/1/2025 | Loan | Brighton | West Ham UtdUntil 1/27/2026 | Defender | ||
| 8/29/2025 | Transfer | Southampton | West Ham UtdUntil 7/2/2026 | Midfielder | ||
| 8/29/2025 | Transfer | Monaco | West Ham Utd | Midfielder | ||
 🏴Danny Ings | 8/27/2025 | Transfer | West Ham Utd | Sheffield UtdUntil 7/8/2026 | Forward | |
| 8/22/2025 | Loan | West Ham Utd | FenerbahçeUntil 6/30/2026 | Midfielder | ||
🏴Kaelan Casey | 8/6/2025 | Loan | West Ham Utd | Swansea CityUntil 1/15/2026 | Defender | |
| 8/5/2025 | Transfer | West Ham Utd | Hoffenheim | Defender | ||
 🏴Callum Wilson | 8/2/2025 | Transfer | Newcastle Utd | West Ham UtdUntil 7/9/2026 | Forward | |
| 8/1/2025 | Transfer | Leicester City | West Ham Utd | Goalkeeper | ||
 🏴Kyle Walker-Peters | 7/20/2025 | Transfer | Southampton | West Ham Utd | Defender | |
🇸🇳El Diouf | 7/15/2025 | Transfer | Slavia Praha | West Ham Utd | Defender | |
 🏴Aaron Cresswell | 7/10/2025 | Transfer | West Ham Utd | Stoke City | Defender | |
| 7/10/2025 | Transfer | West Ham Utd | Tottenham | Midfielder | ||
| 7/1/2025 | Free Agent | West Ham Utd | ReleasedUntil 9/10/2025 | Goalkeeper | ||
| 7/1/2025 | Free Agent | West Ham Utd | ReleasedUntil 3/2/2026 | Forward | ||
| 7/1/2025 | Transfer | Nice | West Ham Utd | Defender | ||
🏴Kaelan Casey | 7/1/2025 | Transfer | West Ham Utd U21 | West Ham UtdUntil 8/6/2025 | Defender | |
| 6/30/2025 | Back from Loan | West Ham Utd | NiceUntil 7/1/2025 | Defender | ||
| 6/30/2025 | Back from Loan | West Ham Utd | PSGUntil 9/1/2025 | Midfielder | ||
| 6/30/2025 | Back from Loan | West Ham Utd | BrightonUntil 7/23/2025 | Forward | ||
🏴Xavier Parker | 6/30/2025 | Free Agent | West Ham Utd | Released | Midfielder | |
| 6/30/2025 | Back from Loan | Paris | West Ham Utd | Midfielder | ||
| 6/30/2025 | Back from Loan | Real Sociedad | West Ham UtdUntil 9/1/2025 | Defender | ||
| 6/30/2025 | Back from Loan | Genoa | West Ham UtdUntil 9/1/2025 | Forward | ||
| 6/30/2025 | Back from Loan | Al Orubah | West Ham UtdUntil 9/3/2025 | Defender |
