The group stage of the 2013 AFC Champions League was played from 26 February to 1 May 2013.
A total of 32 teams competed in the group stage.
[1] The draw for the group stage was held on 6 December 2012, 16:00 UTC+8, at the AFC House in Kuala Lumpur, Malaysia.
The following 32 teams (16 from West Zone, 16 from East Zone) were entered into the group-stage draw, which included the 29 automatic qualifiers and the three qualifying play-off winners, whose identity was not known at the time of the draw:
The winners and runners-up of each group advanced to the round of 16.