| 1. Ronde | 18.10.2020 | Arenas de Getxo | - | Athletic Club B | 1:1 |  |
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| 2. Ronde | 25.10.2020 | Athletic Club B | - | Racing Santander | 0:1 | ||||
| 5. Ronde | 14.11.2020 | Athletic Club B | - | CD Alavés B | 2:0 | ||||
| 6. Ronde | 22.11.2020 | SD Leioa | - | Athletic Club B | 1:1 | ||||
| 9. Ronde | 03.01.2021 | Athletic Club B | - | Barakaldo CF | 3:0 | ||||
| 13. Ronde | 24.01.2021 | Racing Santander | - | Athletic Club B | 1:1 |  |
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| 20. Ronde | 14.03.2021 | Barakaldo CF | - | Athletic Club B | 3:1 | ||||
| 17. Ronde | 17.03.2021 | Athletic Club B | - | SD Leioa | 4:0 | ||||
| 21. Ronde | 21.03.2021 | Athletic Club B | - | Real Sociedad B | 1:2 |
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