2005 AFC Champions League

The championship was retained by the Saudi Arabian club Al-Ittihad with a 5–3 aggregate victory over Al Ain from the United Arab Emirates.

Following a 1–1 draw at the Tahnoun bin Mohammed Stadium in Al Ain in the first leg, Al-Ittihad recorded a 4–2 victory at the Prince Abdullah Al Faisal Stadium in Jeddah to lift the trophy for the second consecutive season.

The clubs were ranked according to points and tie breakers were in the following order: The seven group winners along with the defending champion advanced to the quarter-finals.

The games were conducted in 2 legs, home and away, and the aggregate score decided the match winner.

If still tied, clubs played extra time, where "away goals rule" still applied.