| 1. Round | 29/07/2023 | Fortuna Düsseldorf | - | Hertha BSC | 1:0 |  |
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| 3. Round | 19/08/2023 | Fortuna Düsseldorf | - | SC Paderborn 07 | 1:2 | ||||
| 5. Round | 01/09/2023 | Fortuna Düsseldorf | - | Karlsruher SC | 3:1 | ||||
| 8. Round | 29/09/2023 | Hamburger SV | - | Fortuna Düsseldorf | 1:0 | ||||
| 9. Round | 06/10/2023 | Fortuna Düsseldorf | - | VfL Osnabrück | 1:1 | ||||
| 10. Round | 21/10/2023 | Fortuna Düsseldorf | - | 1. FC Kaiserslautern | 4:3 | |
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| 11. Round | 27/10/2023 | Eintracht Braunschweig | - | Fortuna Düsseldorf | 1:4 | ||||
| 14. Round | 25/11/2023 | Fortuna Düsseldorf | - | FC Schalke 04 | 5:3 | ||||
| 15. Round | 02/12/2023 | 1. FC Nürnberg | - | Fortuna Düsseldorf | 0:5 | ||||
| 17. Round | 16/12/2023 | 1. FC Magdeburg | - | Fortuna Düsseldorf | 2:3 | ||||
| 19. Round | 27/01/2024 | Fortuna Düsseldorf | - | FC St. Pauli | 1:2 | ||||
| 25. Round | 08/03/2024 | Fortuna Düsseldorf | - | Hamburger SV | 2:0 | ||||
| 26. Round | 15/03/2024 | VfL Osnabrück | - | Fortuna Düsseldorf | 0:4 |  |
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| 27. Round | 30/03/2024 | 1. FC Kaiserslautern | - | Fortuna Düsseldorf | 1:3 | ||||
| 28. Round | 07/04/2024 | Fortuna Düsseldorf | - | Eintracht Braunschweig | 2:0 | |
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| 34. Round | 19/05/2024 | Fortuna Düsseldorf | - | 1. FC Magdeburg | 3:2 |
Japan