| 18. Round | 12/02/2021 | NK Sesvete | - | NK Kustošija | 0:0 | ||||
| 20. Round | 27/02/2021 | NK Rudeš | - | NK Kustošija | 1:2 | ||||
| 21. Round | 06/03/2021 | NK Kustošija | - | HNK Cibalia | 2:2 | ||||
| 24. Round | 02/04/2021 | Hrvatski Dragovoljac | - | NK Kustošija | 1:0 |  |
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| 25. Round | 10/04/2021 | NK Kustošija | - | NK Osijek II | 1:0 | ||||
| 29. Round | 01/05/2021 | NK Kustošija | - | NK Inter Zaprešić | 0:1 | ||||
| 30. Round | 08/05/2021 | NK Croatia Zmijavci | - | NK Kustošija | 1:2 | ||||
| 31. Round | 12/05/2021 | NK Opatija | - | NK Kustošija | 0:0 | ||||
| 33. Round | 23/05/2021 | NK BSK Bijelo Brdo | - | NK Kustošija | 3:3 | ||||
| 34. Round | 29/05/2021 | NK Kustošija | - | Hajduk Split II | 1:3 |
Croatia