The 2012 AFC Cup group stage was contested by a total of 32 teams (20 from West Asia Zone and 12 from East Asia Zone). They included:
The draw for the group stage was held at the AFC house in Kuala Lumpur, Malaysia on 6 December 2011, 15:00 UTC+08:00. The 32 teams were drawn into eight groups of four. Clubs from the same country may not be drawn into the same group.
In each group, teams played each other home-and-away in a round-robin format. The matchdays were 6–7 March, 20–21 March, 3–4 April, 10–11 April, 24–25 April, and 8–9 May 2012. The winners and runners-up of each group advanced to the knockout stage.
The teams are ranked according to points (3 points for a win, 1 point for a tie, 0 points for a loss) and tie breakers are in following order:
Each team had been numbered from 1 to 4, the numbers determine the order of the fixtures: