| 2. Round | 15/08/1998 | Gaziantepspor | - | Sakaryaspor | 2:0 |  |
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| 5. Round | 12/09/1998 | Antalyaspor | - | Gaziantepspor | 3:1 | ||||
| 6. Round | 19/09/1998 | Gaziantepspor | - | Dardanelspor | 1:0 | ||||
| 8. Round | 17/10/1998 | Bursaspor | - | Gaziantepspor | 2:1 | ||||
| 9. Round | 24/10/1998 | Gaziantepspor | - | Kocaelispor | 1:2 | ||||
| 10. Round | 30/10/1998 | İstanbulspor AŞ | - | Gaziantepspor | 0:0 | ||||
| 12. Round | 13/11/1998 | Fenerbahçe | - | Gaziantepspor | 4:0 | ||||
| 14. Round | 26/11/1998 | Adanaspor | - | Gaziantepspor | 3:1 | ||||
| 15. Round | 05/12/1998 | Gaziantepspor | - | Samsunspor | 1:1 | ||||
| 16. Round | 12/12/1998 | Karabükspor | - | Gaziantepspor | 2:6 |  |
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| 25. Round | 19/03/1999 | Gaziantepspor | - | Bursaspor | 5:2 | ||||
| 27. Round | 10/04/1999 | Gaziantepspor | - | İstanbulspor AŞ | 2:1 | ||||
| 31. Round | 09/05/1999 | Gaziantepspor | - | Adanaspor | 3:1 | ||||
| 34. Round | 30/05/1999 | Galatasaray | - | Gaziantepspor | 0:0 |
Turkey