| 1. Round | 03/08/2003 | Bor. Mönchengladbach | - | 1. FC Köln | 1:0 | ||||
| 2. Round | 09/08/2003 | 1. FC Köln | - | 1. FC Kaiserslautern | 1:2 |  |
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| 3. Round | 17/08/2003 | FC Schalke 04 | - | 1. FC Köln | 2:1 |  |
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| 5. Round | 13/09/2003 | TSV 1860 München | - | 1. FC Köln | 2:1 | ||||
| 6. Round | 20/09/2003 | 1. FC Köln | - | VfL Wolfsburg | 2:3 | ||||
| 8. Round | 04/10/2003 | VfB Stuttgart | - | 1. FC Köln | 0:0 | ||||
| 9. Round | 18/10/2003 | 1. FC Köln | - | SC Freiburg | 1:0 | ||||
| 10. Round | 25/10/2003 | Eintracht Frankfurt | - | 1. FC Köln | 2:0 | ||||
| 11. Round | 01/11/2003 | 1. FC Köln | - | Hannover 96 | 1:2 | ||||
| 12. Round | 08/11/2003 | VfL Bochum | - | 1. FC Köln | 4:0 | ||||
| 13. Round | 22/11/2003 | 1. FC Köln | - | Hamburger SV | 0:1 | ||||
| 14. Round | 29/11/2003 | Bayern München | - | 1. FC Köln | 2:2 | ||||
| 18. Round | 31/01/2004 | 1. FC Köln | - | Bor. Mönchengladbach | 1:0 | ||||
| 21. Round | 22/02/2004 | Borussia Dortmund | - | 1. FC Köln | 1:0 | ||||
| 22. Round | 28/02/2004 | 1. FC Köln | - | TSV 1860 München | 1:3 | ||||
| 33. Round | 15/05/2004 | 1. FC Köln | - | Hansa Rostock | 4:0 | ||||
| 34. Round | 22/05/2004 | Hertha BSC | - | 1. FC Köln | 3:1 |
Germany