The 2015 AFC Champions League group stage was played from 24 February to 6 May 2015. A total of 32 teams competed in the group stage to decide the 16 places in the knockout stage of the 2015 AFC Champions League.
The draw for the group stage was held on 11 December 2014, 16:00 UTC+8, at the Petaling Jaya Hilton Hotel in Kuala Lumpur, Malaysia. The 32 teams were drawn into eight groups of four. Teams from the same association could not be drawn into the same group.
The following 32 teams (16 from West Zone, 16 from East Zone) were entered into the group stage draw, which included the 24 automatic qualifiers and the eight qualifying play-off winners, whose identity was not known at the time of the draw:
In the group stage, each group was played on a home-and-away round-robin basis. The winners and runners-up of each group advanced to the round of 16.
The teams are ranked according to points (3 points for a win, 1 point for a draw, 0 points for a loss). If tied on points, tiebreakers are applied in the following order:
The matchdays were 24–25 February, 3–4 March, 17–18 March, 7–8 April, 21–22 April, and 5–6 May 2015.