| 12. Round | 17/10/2003 | Rot-Weiß Erfurt | - | 1. FSV Mainz 05 II | 1:1 | ||||
| 13. Round | 22/10/2003 | 1. FSV Mainz 05 II | - | 1. FC Schweinfurt 05 | 2:0 | ||||
| 16. Round | 15/11/2003 | Bayern München II | - | 1. FSV Mainz 05 II | 2:2 | ||||
| 18. Round | 19/11/2003 | 1. FSV Mainz 05 II | - | Stuttgarter Kickers | 1:1 | ||||
| 19. Round | 07/12/2003 | 1. FC Kaiserslautern II | - | 1. FSV Mainz 05 II | 0:1 | ||||
| 20. Round | 29/02/2004 | 1. FSV Mainz 05 II | - | Kickers Offenbach | 1:0 | ||||
| 22. Round | 13/03/2004 | 1. FSV Mainz 05 II | - | SV 07 Elversberg | 2:0 | ||||
| 23. Round | 20/03/2004 | FC Augsburg | - | 1. FSV Mainz 05 II | 1:0 | ||||
| 25. Round | 02/04/2004 | SC Pfullendorf | - | 1. FSV Mainz 05 II | 1:1 | ||||
| 26. Round | 12/04/2004 | 1. FSV Mainz 05 II | - | VfB Stuttgart II | 1:0 | ||||
| 27. Round | 17/04/2004 | 1. SC Feucht | - | 1. FSV Mainz 05 II | 2:1 | ||||
| 31. Round | 15/05/2004 | 1. FSV Mainz 05 II | - | 1. FC Saarbrücken | 1:0 | ||||
| 32. Round | 22/05/2004 | VfR Aalen | - | 1. FSV Mainz 05 II | 3:2 | ||||
| 33. Round | 29/05/2004 | 1. FSV Mainz 05 II | - | Bayern München II | 0:3 |
Germany