| Club: | Olympiacos |
| Season: | 2004–05 |
| Manager: | Dušan Bajević |
| Chairman: | Sokratis Kokkalis |
| Stadium: | Karaiskakis Stadium, Piraeus |
| League: | Alpha Ethniki |
| League Result: | 1st |
| Cup1: | Greek Cup |
| Cup1 Result: | Winners |
| Cup2: | Champions League |
| Cup2 Result: | Group stage |
| Cup3: | UEFA Cup |
| Cup3 Result: | Round of 16 |
| League Topscorer: | Rivaldo (12) |
| Season Topscorer: | Rivaldo (15) |
| Highest Attendance: | 30,500 vs Sochaux (1 November 2005) |
| Pattern La1: | _white_stripes |
| Pattern B1: | _olympiacosfc0405h |
| Pattern Ra1: | _white_stripes |
| Pattern So1: | _olympiacosfc0304h |
| Leftarm1: | F20D2F |
| Body1: | F20D2F |
| Rightarm1: | F20D2F |
| Shorts1: | FFFFFF |
| Socks1: | F20D2F |
| Pattern Sh2: | _olympiacosfc0405a |
| Pattern So2: | _olympiacosfc0405a |
| Leftarm2: | 000000 |
| Body2: | 000000 |
| Rightarm2: | 000000 |
| Shorts2: | 000000 |
| Socks2: | 000000 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
The 2004–05 season was Olympiacos's 46th consecutive season in the Alpha Ethniki and their 79th year in existence. The club were played their 8th consecutive season in the UEFA Champions League. In the beginning of the summertime Olympiacos named Norwegian Trond Sollied coach.[1]
See main article: 2004–05 Alpha Ethniki.
All times at EET
See main article: 2004–05 Greek Football Cup.
See main article: 2004–05 UEFA Champions League.
See main article: 2004–05 UEFA Cup.
See main article: 2004–05 UEFA Cup final phase.
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