| 1. Jornada | 14.08.2020 | NK Opatija | - | Hajduk Split II | 2:1 | ||||
| 2. Jornada | 22.08.2020 | NK Sesvete | - | NK Opatija | 0:1 |  |
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| 4. Jornada | 12.09.2020 | NK Rudeš | - | NK Opatija | 1:2 | |
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| 5. Jornada | 15.09.2020 | NK Opatija | - | HNK Cibalia | 0:1 | ||||
| 6. Jornada | 19.09.2020 | NK Dubrava | - | NK Opatija | 1:4 | |
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| 3. Jornada | 23.09.2020 | NK Opatija | - | NK Solin | 1:1 | ||||
| 7. Jornada | 27.09.2020 | NK Opatija | - | HNK Orijent Rijeka | 1:1 |  |
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| 8. Jornada | 30.09.2020 | Hrvatski Dragovoljac | - | NK Opatija | 1:1 | ||||
| 9. Jornada | 03.10.2020 | NK Opatija | - | NK Osijek II | 1:1 | ||||
| 10. Jornada | 17.10.2020 | NK Junak Sinj | - | NK Opatija | 0:2 | |
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| 12. Jornada | 30.10.2020 | NK Međimurje | - | NK Opatija | 3:0 | ||||
| 11. Jornada | 14.11.2020 | NK Opatija | - | NK Dugopolje | 2:1 | ||||
| 14. Jornada | 21.11.2020 | NK Kustošija | - | NK Opatija | 2:1 | ||||
| 13. Jornada | 25.11.2020 | NK Opatija | - | NK Inter Zaprešić | 3:2 | |
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| 15. Jornada | 28.11.2020 | NK Opatija | - | NK Croatia Zmijavci | 2:3 | |
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| 17. Jornada | 13.12.2020 | NK BSK Bijelo Brdo | - | NK Opatija | 1:1 | |
Croacia