| 1. Jornada | 18.10.2020 | Arenas de Getxo | - | Bilbao Athletic | 1:1 | ||||
| 4. Jornada | 07.11.2020 | Bilbao Athletic | - | SD Amorebieta | 2:1 | ||||
| 5. Jornada | 14.11.2020 | Bilbao Athletic | - | Alavés B | 2:0 |  |
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| 6. Jornada | 22.11.2020 | SD Leioa | - | Bilbao Athletic | 1:1 |  |
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| 8. Jornada | 05.12.2020 | CD Laredo | - | Bilbao Athletic | 2:2 | ||||
| 10. Jornada | 19.12.2020 | Real Sociedad B | - | Bilbao Athletic | 1:2 | |
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| 9. Jornada | 03.01.2021 | Bilbao Athletic | - | Barakaldo CF | 3:0 | ||||
| 11. Jornada | 10.01.2021 | Bilbao Athletic | - | Real Unión | 0:0 | ||||
| 12. Jornada | 16.01.2021 | Bilbao Athletic | - | Arenas de Getxo | 1:1 | ||||
| 13. Jornada | 24.01.2021 | Real Racing | - | Bilbao Athletic | 1:1 | ||||
| 14. Jornada | 30.01.2021 | Bilbao Athletic | - | Club Portugalete | 2:0 | ||||
| 16. Jornada | 14.02.2021 | Alavés B | - | Bilbao Athletic | 0:2 | ||||
| 17. Jornada | 17.03.2021 | Bilbao Athletic | - | SD Leioa | 4:0 | |
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| 22. Jornada | 28.03.2021 | Real Unión | - | Bilbao Athletic | 0:1 |
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