| 2. Round | 25/10/2020 | Athletic Club B | - | Racing Santander | 0:1 | ||||
| 5. Round | 14/11/2020 | Athletic Club B | - | CD Alavés B | 2:0 | ||||
| 8. Round | 05/12/2020 | CD Laredo | - | Athletic Club B | 2:2 |  |
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| 10. Round | 19/12/2020 | Real Sociedad B | - | Athletic Club B | 1:2 |  |
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| 9. Round | 03/01/2021 | Athletic Club B | - | Barakaldo CF | 3:0 | |
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| 11. Round | 10/01/2021 | Athletic Club B | - | Real Unión | 0:0 | ||||
| 12. Round | 16/01/2021 | Athletic Club B | - | Arenas de Getxo | 1:1 | |
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| 13. Round | 24/01/2021 | Racing Santander | - | Athletic Club B | 1:1 | ||||
| 14. Round | 30/01/2021 | Athletic Club B | - | Club Portugalete | 2:0 | |
Spain