| 1. Jornada | 18.10.2020 | Arenas de Getxo | - | Bilbao Athletic | 1:1 | ||||
| 2. Jornada | 25.10.2020 | Bilbao Athletic | - | Real Racing | 0:1 | ||||
| 3. Jornada | 01.11.2020 | Club Portugalete | - | Bilbao Athletic | 2:3 |  |
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| 6. Jornada | 22.11.2020 | SD Leioa | - | Bilbao Athletic | 1:1 | ||||
| 8. Jornada | 05.12.2020 | CD Laredo | - | Bilbao Athletic | 2:2 | ||||
| 10. Jornada | 19.12.2020 | Real Sociedad B | - | Bilbao Athletic | 1:2 | ||||
| 15. Jornada | 06.02.2021 | SD Amorebieta | - | Bilbao Athletic | 2:3 | |
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| 16. Jornada | 14.02.2021 | Alavés B | - | Bilbao Athletic | 0:2 | ||||
| 19. Jornada | 06.03.2021 | Bilbao Athletic | - | CD Laredo | 2:1 | ||||
| 20. Jornada | 14.03.2021 | Barakaldo CF | - | Bilbao Athletic | 3:1 | |
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| 22. Jornada | 28.03.2021 | Real Unión | - | Bilbao Athletic | 0:1 |
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