| 2026-10-30 | J. Agyekum | Hamburger SV → Agyekum Joel | Free agent |
| 2026-10-30 | A. Vasiljevic | Hamburger SV → Vasiljevic Andrej | Free agent |
| 2026-10-30 | F. Barkowsky | Hamburger SV → Barkowsky Finn | Free agent |
| 2026-10-30 | G. Kiveta Ndongalasiya | Hamburger SV → Kiveta Ndongalasiya Glory | Free agent |
| 2026-09-14 | M. Vušković | Hamburger SV → Hamburger SV | Free agent |
| 2026-09-01 | Daniel Elfadli | Hamburger SV → Lask Linz | Loan |
| 2026-08-31 | E. Sahiti | Hamburger SV → Hannover 96 | Free agent |
| 2026-08-31 | R. Philippe | Hamburger SV → SC Paderborn 07 | Loan |
| 2026-08-31 | Fábio Vieira | Άρσεναλ → Hamburger SV | Transfer |
| 2026-08-31 | Z. El Ouahdi | Genk → Hamburger SV | Transfer |
| 2026-08-31 | D. Møller Wolfe | Wolves → Hamburger SV | Loan |
| 2026-08-30 | E. Sahiti | Hamburger SV → Hannover 96 | Free agent |
| 2026-08-30 | Fábio Vieira | Άρσεναλ → Hamburger SV | Transfer |
| 2026-08-30 | Z. El Ouahdi | Genk → Hamburger SV | Transfer |
| 2026-08-28 | W. Mikelbrencis | Hamburger SV → SV Darmstadt 98 | Free agent |
| 2026-08-27 | J. Dompé | Hamburger SV → Konyaspor | Free agent |
| 2026-08-26 | J. Dompé | Hamburger SV → Konyaspor | Free agent |
| 2026-08-26 | J. Dompé | Hamburger SV → Konyaspor | Free agent |
| 2026-08-23 | T. Moffi | Nice → Hamburger SV | Transfer |
| 2026-08-22 | T. Moffi | Nice → Hamburger SV | Transfer |
| 2026-08-18 | S. Bornauw | Leeds → Hamburger SV | Loan |
| 2026-08-04 | Omar Megeed | Hamburger SV → SpVgg Greuther Fürth | Free agent |
| 2026-08-03 | Omar Megeed | Hamburger SV → SpVgg Greuther Fürth | Free agent |
| 2026-07-23 | B. Nadir | Marseille → Hamburger SV | Free agent |
| 2026-07-22 | B. Nadir | Marseille → Hamburger SV | Free agent |
| 2026-07-21 | P. Daka | Leicester → Hamburger SV | Free agent |
| 2026-07-20 | P. Daka | Leicester → Hamburger SV | Free agent |
| 2026-07-12 | M. Adeline | Estac Troyes → Hamburger SV | Transfer |
| 2026-07-11 | M. Adeline | Estac Troyes → Hamburger SV | Transfer |
| 2026-07-09 | A. Souhmahoro | Hamburger SV → Mallorca | Loan |
| 2026-07-06 | Maurice Osei Boakye | Hamburger SV → Maritimo | Free agent |
| 2026-06-30 | R. Königsdörffer | Hamburger SV → FSV Mainz 05 | Free agent |
| 2026-06-30 | R. Glatzel | Hamburger SV → VfL Wolfsburg | Transfer |
| 2026-06-30 | Ł. Poręba | Hamburger SV → SV Elversberg | Transfer |
| 2026-06-30 | N. Katterbach | Hamburger SV → Eintracht Braunschweig | Loan |
| 2026-06-30 | Rohin Shivani | Hamburger SV → Sportfreunde Lotte | Loan |
| 2026-06-30 | A. Grønbæk | Rennes → Hamburger SV | Transfer |
| 2026-06-30 | L. Posadas | Hamburger SV → Havelse | Free agent |
| 2026-06-30 | L. Bornschein | Hamburger SV → VfL Osnabrück | Free agent |
| 2026-06-30 | B. Yalcinkaya | Hamburger SV → Verl | Transfer |
| 2026-06-30 | Kofi Jeremy Amoako | Dynamo Dresden → Hamburger SV | Transfer |
| 2026-06-30 | A. Vasiljevic | MTK Budapest → Hamburger SV | Transfer |
| 2026-06-29 | E. Sahiti | Maccabi Tel Aviv → Hamburger SV | Return from loan |
| 2026-06-29 | I. Pherai | SV Elversberg → Hamburger SV | Return from loan |
| 2026-06-29 | Ł. Poręba | SV Elversberg → Hamburger SV | Return from loan |
| 2026-06-29 | W. Mikelbrencis | Hamburger SV → Mikelbrencis William | Free agent |
| 2026-06-29 | A. Souhmahoro | Saint Etienne → Hamburger SV | Return from loan |
| 2026-06-29 | L. Vušković | Hamburger SV → Τότεναμ | Return from loan |
| 2026-06-29 | Fábio Vieira | Hamburger SV → Άρσεναλ | Return from loan |
| 2026-06-29 | G. Gocholeishvili | Hamburger SV → Shakhtar Donetsk | Return from loan |
| 2026-06-29 | Maurice Osei Boakye | Hamburger SV → Boakye Maurice | Free agent |
| 2026-06-29 | Maurice Osei Boakye | Hamburger SV → Maritimo | Free agent |
| 2026-06-29 | D. Downs | Hamburger SV → Southampton | Return from loan |
| 2026-06-29 | P. Otele | Hamburger SV → FC Basel 1893 | Return from loan |
| 2026-06-29 | Rohin Shivani | Lubeck → Hamburger SV | Return from loan |
| 2026-06-29 | Rohin Shivani | VfB Lübeck → Hamburger SV | Return from loan |
| 2026-06-29 | A. Grønbæk | Hamburger SV → Rennes | Return from loan |
| 2026-06-29 | J. Agyekum | FC Viktoria Köln → Hamburger SV | Return from loan |
| 2026-06-29 | B. Yalcinkaya | Hamburger SV → Verl | Transfer |
| 2026-06-29 | Kofi Jeremy Amoako | Dynamo Dresden → Hamburger SV | Transfer |
| 2026-06-29 | A. Vasiljevic | MTK Budapest → Hamburger SV | Transfer |
| 2026-02-01 | I. Pherai | Hamburger SV → SV Elversberg | Loan |
| 2026-02-01 | A. Souhmahoro | Hamburger SV → Saint Etienne | Loan |
| 2026-02-01 | W. Omari | Rennes → Hamburger SV | Transfer |
| 2026-02-01 | P. Otele | FC Basel 1893 → Hamburger SV | Loan |
| 2026-02-01 | A. Grønbæk | Rennes → Hamburger SV | Loan |
| 2026-02-01 | Otto Emerson Stange | SV Elversberg → Hamburger SV | Return from loan |
| 2026-01-31 | W. Omari | Hamburger SV → Rennes | Return from loan |
| 2026-01-30 | Guilherme Ramos | Hamburger SV → Beijing Guoan | Transfer |
| 2026-01-29 | E. Sahiti | Hamburger SV → Maccabi Tel Aviv | Loan |
| 2026-01-28 | S. Hefti | Hamburger SV → DC United | Transfer |
| 2026-01-21 | S. Tangvik | Rosenborg → Hamburger SV | Transfer |
| 2026-01-20 | S. Tangvik | Rosenborg → Hamburger SV | Transfer |
| 2026-01-16 | A. Suhonen | Hamburger SV → Odense | Transfer |
| 2026-01-06 | Daniel Peretz | Hamburger SV → Μπάγερν Μονάχου | Return from loan |
| 2026-01-06 | D. Downs | Southampton → Hamburger SV | Loan |
| 2026-01-04 | R. Adam | Hamburger SV → SV Elversberg | Transfer |
| 2026-01-02 | J. Meffert | Hamburger SV → Holstein Kiel | Transfer |