| 5. Round | 15/07/2020 | Tochigi SC | - | RB Omiya Ardija | 1:0 | ||||
| 7. Round | 25/07/2020 | RB Omiya Ardija | - | Matsumoto Yamaga | 1:0 | ||||
| 8. Round | 29/07/2020 | Zweigen Kanazawa | - | RB Omiya Ardija | 0:1 | ||||
| 11. Round | 12/08/2020 | RB Omiya Ardija | - | Júbilo Iwata | 2:2 | ||||
| 12. Round | 16/08/2020 | Renofa Yamaguchi | - | RB Omiya Ardija | 1:0 | ||||
| 16. Round | 02/09/2020 | RB Omiya Ardija | - | Kyoto Sanga FC | 1:0 | ||||
| 17. Round | 05/09/2020 | RB Omiya Ardija | - | Fagiano Okayama | 1:1 | ||||
| 19. Round | 13/09/2020 | RB Omiya Ardija | - | Montedio Yamagata | 1:1 | ||||
| 9. Round | 16/09/2020 | RB Omiya Ardija | - | Avispa Fukuoka | 0:1 |  |
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| 20. Round | 20/09/2020 | FC Machida Zelvia | - | RB Omiya Ardija | 0:0 | |
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| 22. Round | 26/09/2020 | Kyoto Sanga FC | - | RB Omiya Ardija | 2:4 | ||||
| 27. Round | 18/10/2020 | Fagiano Okayama | - | RB Omiya Ardija | 3:2 | ||||
| 28. Round | 21/10/2020 | Matsumoto Yamaga | - | RB Omiya Ardija | 1:1 | ||||
| 29. Round | 25/10/2020 | RB Omiya Ardija | - | V-Varen Nagasaki | 0:0 | ||||
| 30. Round | 01/11/2020 | RB Omiya Ardija | - | FC Ryūkyū | 0:3 | ||||
| 33. Round | 11/11/2020 | Montedio Yamagata | - | RB Omiya Ardija | 2:1 | ||||
| 38. Round | 02/12/2020 | RB Omiya Ardija | - | Ehime FC | 3:3 |
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