| 18. Journée | 13.02.2021 | HNK Orijent Rijeka | - | NK Osijek II | 3:0 | ||||
| 22. Journée | 13.03.2021 | NK Osijek II | - | NK Dugopolje | 2:0 | ||||
| 24. Journée | 02.04.2021 | NK Osijek II | - | NK Inter Zaprešić | 1:2 | ||||
| 25. Journée | 10.04.2021 | NK Kustošija | - | NK Osijek II | 1:0 | ||||
| 28. Journée | 24.04.2021 | NK Osijek II | - | NK BSK Bijelo Brdo | 3:0 | ||||
| 29. Journée | 02.05.2021 | Hajduk Split II | - | NK Osijek II | 4:3 |  |
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| 30. Journée | 08.05.2021 | NK Osijek II | - | NK Sesvete | 0:3 | ||||
| 31. Journée | 12.05.2021 | NK Solin | - | NK Osijek II | 4:3 | ||||
| 32. Journée | 16.05.2021 | NK Osijek II | - | NK Rudeš | 2:3 |  |
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| 33. Journée | 22.05.2021 | HNK Cibalia | - | NK Osijek II | 2:2 | ||||
| 34. Journée | 29.05.2021 | NK Osijek II | - | NK Dubrava | 0:5 |
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