| 3. Jornada | 01.11.2020 | Club Portugalete | - | Bilbao Athletic | 2:3 | ||||
| 4. Jornada | 07.11.2020 | Bilbao Athletic | - | SD Amorebieta | 2:1 | ||||
| 5. Jornada | 14.11.2020 | Bilbao Athletic | - | Alavés B | 2:0 | ||||
| 6. Jornada | 22.11.2020 | SD Leioa | - | Bilbao Athletic | 1:1 | ||||
| 8. Jornada | 05.12.2020 | CD Laredo | - | Bilbao Athletic | 2:2 |  |
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| 10. Jornada | 19.12.2020 | Real Sociedad B | - | Bilbao Athletic | 1:2 | ||||
| 20. Jornada | 14.03.2021 | Barakaldo CF | - | Bilbao Athletic | 3:1 | ||||
| 17. Jornada | 17.03.2021 | Bilbao Athletic | - | SD Leioa | 4:0 | ||||
| 21. Jornada | 21.03.2021 | Bilbao Athletic | - | Real Sociedad B | 1:2 |  |
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| 22. Jornada | 28.03.2021 | Real Unión | - | Bilbao Athletic | 0:1 |
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