2008 AFC Champions League
The 2008 AFC Champions League was the 27th AFC Champions League, the top-level Asian club football tournament, and the 6th under the current AFC Champions League title. It was the last AFC Champions League before the competition expanded to 32 teams.
Gamba Osaka defeated Adelaide United 5–0 on aggregate in the final to win their first AFC Champions League title. Both clubs qualified for the 2008 FIFA Club World Cup: Gamba Osaka as the AFC representative, and Adelaide United as the host nation's representative, since Japan's spot was reallocated due to Gamba Osaka's qualification as continental champion.
Urawa Red Diamonds were the defending champions, but were eliminated by the eventual winners Gamba Osaka in the semi-finals.
Format
Group stage
A total of 28 clubs were divided into seven groups of four, based on region i.e. East Asian and Southeast Asian clubs were drawn in groups E to G, while the rest were grouped in groups A to D. Each club played double round-robin against the other three group members, a total of six matches each. Clubs received three points for a win, one for a draw, and zero for a loss. The clubs were ranked according to points and tie breakers were in the following order:- Points in head-to-head matches among the tied teams;
- Goal difference in head-to-head matches among the tied teams;
- Goals scored in head-to-head matches among the tied teams;
- Goal difference in all group matches;
- Goals scored in all group matches;
;Knockout stage
An open draw was held for the knockout stage; teams from the same group or the same association could not be drawn against each other. Each tie was played on a home-and-away two-legged basis. The away goals rule, extra time and penalty shoot-outs were used to decide the winner if necessary.
Schedule
Teams
were initially allocated two entries. However, on 12 December 2007, the AFC redistributed Indonesia's entries to Thailand and Vietnam as the Indonesian domestic league and cup tournament wouldn't be completed in time for the start of the tournament.;Notes
Group stage
Group A
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Group B
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Group C
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Group D
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Group E
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Group F
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Group G
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Knock-out stage
Bracket
Quarter-finals
Semi-finals
Final
Top scorers
The top scorers from the 2008 AFC Champions League are as follows:| Rank | Player | Club | Goals |
| 1 |  Fair Play Award |