2003–04 Olympiacos F.C. season

The 2003–04 season was Olympiacos's 45th consecutive season in the Alpha Ethniki and their 78th year in existence. The club were played their 7th consecutive season in the UEFA Champions League. In the beginning of the summertime Olympiacos named Greek Nikos Alefantos coach.

First-team squad

 * Squad at end of season

Matches
All times at EET

Second round
Olympiacos qualified to the Round of 16 without a match.

Group stage
All times at CET

Team kit