The 1888–89 AHAC season was the third season of the Amateur Hockey Association of Canada. Play was in challenges and started on December 15, 1888. The Montreal Hockey Club would win the final challenge of the season to win the Canadian championship for the second season in a row. The league reverted to the challenge system, hoping to attract teams from outside Montreal. Quebec would return to play in the AHAC. The number of games was reduced to only four.
The league adopted a rule where the placement of the 'bully' or faceoff, could be played at the point of infringement, or at the point of play stoppage, at the choice of the captain of the offended team after a rules infraction.