| 15. Round | 25/11/2023 | 1. FC Nürnberg [Youth B] | - | 1. FSV Mainz 05 [Youth B] | 4:4 |  |
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| 16. Round | 02/12/2023 | 1. FSV Mainz 05 [Youth B] | - | 1. FC Kaiserslautern [Youth B] | 4:1 | |
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| 17. Round | 10/12/2023 | FC Augsburg [Youth B] | - | 1. FSV Mainz 05 [Youth B] | 0:0 | ||||
| 18. Round | 17/12/2023 | 1. FSV Mainz 05 [Youth B] | - | SC Freiburg [Youth B] | 1:1 | ||||
| 19. Round | 18/02/2024 | Bayern München [Youth B] | - | 1. FSV Mainz 05 [Youth B] | 1:4 | ||||
| 20. Round | 24/02/2024 | 1. FSV Mainz 05 [Youth B] | - | VfB Stuttgart [Youth B] | 2:2 | ||||
| 21. Round | 03/03/2024 | 1. FC Heidenheim 1846 [Youth B] | - | 1. FSV Mainz 05 [Youth B] | 1:1 | ||||
| 22. Round | 10/03/2024 | 1. FSV Mainz 05 [Youth B] | - | Jahn Regensburg [Youth B] | 2:0 |  |
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| 23. Round | 06/04/2024 | 1. FSV Mainz 05 [Youth B] | - | TSV 1860 München [Youth B] | 5:3 | |
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| 24. Round | 13/04/2024 | 1899 Hoffenheim [Youth B] | - | 1. FSV Mainz 05 [Youth B] | 1:1 | |
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| 25. Round | 20/04/2024 | 1. FSV Mainz 05 [Youth B] | - | FC Ingolstadt 04 [Youth B] | 3:1 | ||||
| 26. Round | 27/04/2024 | Karlsruher SC [Youth B] | - | 1. FSV Mainz 05 [Youth B] | 3:1 |
Poland