| 21. Round | 10/02/2024 | SC Wiedenbrück | - | Fortuna Köln | 3:1 |  |
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| 22. Round | 17/02/2024 | Fortuna Köln | - | SSVg Velbert | 2:1 | ||||
| 24. Round | 02/03/2024 | Fortuna Köln | - | Rot-Weiß Oberhausen | 2:1 | ||||
| 25. Round | 09/03/2024 | FC Gütersloh | - | Fortuna Köln | 1:1 |  |
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| 26. Round | 16/03/2024 | Fortuna Köln | - | Fortuna Düsseldorf II | 4:1 | ||||
| 27. Round | 30/03/2024 | Alemannia Aachen | - | Fortuna Köln | 1:0 | ||||
| 28. Round | 06/04/2024 | Rot Weiss Ahlen | - | Fortuna Köln | 0:2 | ||||
| 29. Round | 13/04/2024 | Fortuna Köln | - | 1. FC Bocholt | 0:1 | ||||
| 30. Round | 20/04/2024 | 1. FC Düren | - | Fortuna Köln | 2:2 | ||||
| 31. Round | 26/04/2024 | Fortuna Köln | - | Wuppertaler SV | 2:1 | |
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| 32. Round | 04/05/2024 | Bor. Mönchengladbach II | - | Fortuna Köln | 2:1 | ||||
| 34. Round | 18/05/2024 | SV Rödinghausen | - | Fortuna Köln | 1:0 |
Germany