| 31. Round | 04/11/2020 | Giravanz Kitakyushu | - | RB Omiya Ardija | 1:2 | ||||
| 32. Round | 08/11/2020 | RB Omiya Ardija | - | Ventforet Kofu | 1:2 | ||||
| 33. Round | 11/11/2020 | Montedio Yamagata | - | RB Omiya Ardija | 2:1 | ||||
| 34. Round | 15/11/2020 | RB Omiya Ardija | - | Zweigen Kanazawa | 1:0 | ||||
| 35. Round | 21/11/2020 | RB Omiya Ardija | - | FC Machida Zelvia | 0:0 | ||||
| 36. Round | 25/11/2020 | Thespakusatsu Gunma | - | RB Omiya Ardija | 1:2 | ||||
| 38. Round | 02/12/2020 | RB Omiya Ardija | - | Ehime FC | 3:3 | ||||
| 39. Round | 06/12/2020 | Júbilo Iwata | - | RB Omiya Ardija | 2:0 | ||||
| 40. Round | 13/12/2020 | RB Omiya Ardija | - | Renofa Yamaguchi | 3:1 | ||||
| 41. Round | 16/12/2020 | Tokushima Vortis | - | RB Omiya Ardija | 1:0 | ||||
| 42. Round | 20/12/2020 | RB Omiya Ardija | - | Albirex Niigata | 3:1 |
Japan