| Club: | Alemannia Aachen |
| Season: | 2004–05 |
| Manager: | Dieter Hecking |
| Stadium: | Old Tivoli (domestic matches) RheinEnergieStadion (European matches) |
| League: | 2. Bundesliga |
| League Result: | 6th |
| Cup1: | DFB-Pokal |
| Cup1 Result: | Second round |
| Cup2: | UEFA Cup |
| Cup2 Result: | Round of 32 |
| League Topscorer: | Kai Michalke (11) |
| Pattern La1: | _thingoldstripes |
| Pattern B1: | _thingoldstripes |
| Pattern Ra1: | _thingoldstripes |
| Leftarm1: | 000066 |
| Body1: | 000066 |
| Rightarm1: | 000066 |
| Shorts1: | 000040 |
| Socks1: | 000040 |
| Leftarm2: | FFD700 |
| Body2: | FFD700 |
| Rightarm2: | FFD700 |
| Shorts2: | FFD700 |
| Socks2: | FFD700 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
During the 2004–05 German football season, Alemannia Aachen competed in the 2. Bundesliga.
Alemannia Aachen failed to gain promotion to the Bundesliga or even repeat their cup run of the previous season, but still enjoyed a decent run in the UEFA Cup, making it through the group stages before being knocked out in the round of 32 by eventual semi-finalists AZ.
Squad at end of season[1]