| 1. Round | 26/07/2003 | NK Osijek | - | NK Inter Zaprešić | 3:2 | ||||
| 2. Round | 03/08/2003 | HNK Cibalia | - | NK Osijek | 3:2 | ||||
| 3. Round | 09/08/2003 | NK Osijek | - | NK Varteks | 3:1 |  |
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| 4. Round | 16/08/2003 | Dinamo Zagreb | - | NK Osijek | 4:0 | ||||
| 5. Round | 23/08/2003 | NK Osijek | - | NK Marsonia | 2:1 | |
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| 6. Round | 30/08/2003 | HNK Rijeka | - | NK Osijek | 2:0 | |
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| 10. Round | 04/10/2003 | NK Osijek | - | NK Zagreb | 5:2 | ||||
| 11. Round | 20/10/2003 | Kamen Ingrad | - | NK Osijek | 2:0 | ||||
| 12. Round | 25/10/2003 | NK Inter Zaprešić | - | NK Osijek | 1:1 | |
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| 13. Round | 02/11/2003 | NK Osijek | - | HNK Cibalia | 2:1 | |
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| 15. Round | 23/11/2003 | NK Osijek | - | Dinamo Zagreb | 3:2 | ||||
| 16. Round | 29/11/2003 | NK Marsonia | - | NK Osijek | 1:2 | |
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| 17. Round | 06/12/2003 | NK Osijek | - | HNK Rijeka | 2:3 | ||||
| 18. Round | 21/02/2004 | NK Zadar | - | NK Osijek | 1:1 | |
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| 19. Round | 28/02/2004 | Slaven Belupo | - | NK Osijek | 3:3 |  |
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| 20. Round | 06/03/2004 | NK Osijek | - | Hajduk Split | 2:3 | |
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| 22. Round | 20/03/2004 | NK Osijek | - | Kamen Ingrad | 3:2 |
Croatia