The 2009–10 AHL season was the 74thseason of the American Hockey League. Twenty-nine teams played 80 regular-season games each from October 2 to April 11. This season featured the addition of one new team, the relocation of two others, and the involuntary suspension of another.
On June 11, 2009, both the Hamilton Bulldogs and the Toronto Marlies were invited to participate in a four-team preseason tournament in Edinburgh, Scotland, to celebrate Scotland’s contribution to the game of ice hockey.
The Edinburgh Capitals, Scotland’s only Elite Ice Hockey team, hosted the tournament from September 24–27. The Bulldogs and Marlies played the Capitals and the Belfast Giants in order to win the Gardiner Cup. Hamilton defeated Toronto in the final.
The top four teams from each division played for the Calder Cup. The league's rules included one exception: if the fifth-place team in the Atlantic Division finishes better than the fourth-place team in the East Division, they assume the fourth playoff spot in the East Division. The Atlantic Division's Bridgeport Sound Tigers qualified for the playoffs under this proviso.
Texas Stars joined the league with a limited membership and will be operated by the Dallas Stars. The limited membership is conditioned on the completed purchase of an existing AHL franchise within one year.
Iowa Chops were involuntarily suspended on July 7, 2009, by the AHL Board of Governors for the 2009-10 season for being "unable to remedy certain violations of the provisions of the league’s Constitution and By-Laws" .
The following goaltenders with a minimum 1560 minutes played led the league in goals against average at the end of the regular season.
GP = Games played; TOI = Time on ice (in minutes); SA = Shots against; GA = Goals against; SO = Shutouts; GAA = Goals against average; SV% = Save percentage; W = Wins; L = Losses; OT = Overtime/shootout loss