In season 2003–04 Celtic won a double of the Scottish Premier League championship and the Scottish Cup.

They reached the quarter-finals of the Scottish League Cup, and the UEFA Cup after competing in the group stage of the Champions League.

NOTE: scores are written Celtic first Win Draw Loss Key: Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

List of squad players, including number of appearances by competition