| 1. Round | 03/09/2023 | UD Logroñés | - | Athletic Club B | 0:0 | ||||
| 2. Round | 09/09/2023 | Athletic Club B | - | Utebo FC | 0:1 |  |
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| 6. Round | 08/10/2023 | CD Alavés B | - | Athletic Club B | 0:2 | ||||
| 7. Round | 14/10/2023 | Athletic Club B | - | Real Zaragoza B | 2:0 | ||||
| 10. Round | 04/11/2023 | Arenas de Getxo | - | Athletic Club B | 0:3 | |
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| 12. Round | 19/11/2023 | CD Calahorra | - | Athletic Club B | 0:1 | ||||
| 13. Round | 25/11/2023 | Athletic Club B | - | CD Tudelano | 4:0 | ||||
| 15. Round | 09/12/2023 | Athletic Club B | - | Real Sociedad C | 3:0 |
Spain