| 1. Round | 07/04/2021 | SD Leioa | - | UD Mutilvera | 0:1 | ||||
| 2. Round | 11/04/2021 | UD Mutilvera | - | Barakaldo CF | 0:0 | ||||
| 3. Round | 18/04/2021 | CD Alavés B | - | UD Mutilvera | 0:0 | ||||
| 5. Round | 01/05/2021 | UD Mutilvera | - | SD Leioa | 4:1 | ||||
| 4. Round | 05/05/2021 | UD Mutilvera | - | Club Portugalete | 1:0 | ||||
| 6. Round | 09/05/2021 | Barakaldo CF | - | UD Mutilvera | 1:1 | ||||
| 8. Round | 22/05/2021 | Club Portugalete | - | UD Mutilvera | 1:1 |  |
Spain