| 3. Round | 01/11/2020 | Club Portugalete | - | Athletic Club B | 2:3 | ||||
| 4. Round | 07/11/2020 | CD Alavés B | - | Club Portugalete | 1:0 | ||||
| 5. Round | 15/11/2020 | Club Portugalete | - | SD Leioa | 1:0 | ||||
| 7. Round | 29/11/2020 | Club Portugalete | - | CD Laredo | 0:1 | ||||
| 9. Round | 12/12/2020 | Club Portugalete | - | Real Sociedad B | 1:1 |  |
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| 10. Round | 20/12/2020 | Real Unión | - | Club Portugalete | 2:1 | ||||
| 11. Round | 10/01/2021 | Club Portugalete | - | Arenas de Getxo | 0:1 | ||||
| 12. Round | 16/01/2021 | Club Portugalete | - | Racing Santander | 0:1 | ||||
| 13. Round | 23/01/2021 | SD Amorebieta | - | Club Portugalete | 2:1 | ||||
| 14. Round | 30/01/2021 | Athletic Club B | - | Club Portugalete | 2:0 | |
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| 15. Round | 06/02/2021 | Club Portugalete | - | CD Alavés B | 0:0 | ||||
| 18. Round | 28/02/2021 | CD Laredo | - | Club Portugalete | 0:1 | ||||
| 19. Round | 06/03/2021 | Club Portugalete | - | Barakaldo CF | 2:0 | ||||
| 16. Round | 10/03/2021 | SD Leioa | - | Club Portugalete | 1:2 | ||||
| 20. Round | 14/03/2021 | Real Sociedad B | - | Club Portugalete | 2:0 | ||||
| 21. Round | 21/03/2021 | Club Portugalete | - | Real Unión | 2:0 | |
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| 22. Round | 28/03/2021 | Arenas de Getxo | - | Club Portugalete | 1:0 |
Spain