attack
Windsor St. Clair Saints net in 2007-08 Season The league traces its history back to 1890. The first season of Ontario Hockey Association senior hockey was the 1890-91 season, for the
Cosby Cup.
Ottawa Hockey Club won the first ever Senior title defeating Toronto St. Georges 5–0. The first "Major" league came in 1929, known as the
OHA Senior A Hockey League. The league lasted for fifty seasons, its teams winning 16
Allan Cups. The league was replaced by the
Continental Senior A Hockey League in 1979. The Continental league was renamed the OHA Senior A Hockey League in 1980 and lasted until 1987. Teams of the Continental league won 4 Allan Cups. In 1990, the
Southwestern Senior "A" Hockey League was incorporated through the merger between the
Central Senior "B" Hockey League, the
Seaway-Cyclone Senior "B" Hockey League, and the
Southern Ontario Senior "A" Hockey League. It became
Major League Hockey in 2003. The formation of the
Major League Hockey marked the first time since 1987 and the folding of the
OHA Senior A Hockey League that the
Ontario Hockey Association (OHA) has crowned a top level senior league. In 2005, the OHA also granted the
Eastern Ontario Senior Hockey League the same status. In 2008, the
Brantford Blast became the first OHA team since the
Brantford Motts Clamatos in 1987 to win the
Allan Cup. As hosts of the
2008 Allan Cup, the Blast failed to win their league and were allowed to bypass the OHA Final against the
Whitby Dunlops and the
Renwick Cup against the
Thunder Bay Hawks. After almost a months rest, the Blast competed at home for the Allan Cup and won the entire thing. After suffering their only loss of the tournament to the
Shawinigan Xtreme in the first game, the Blast defeated the
Bentley Generals to clinch second in their division. They defeated the Robertson Cup and
EOSHL champion
Whitby Dunlops in the quarter-final. They then knocked off the
Major League Hockey and
Renwick Cup champion
Dundas Real McCoys in the semi-final. They met Bentley again in the final, and defeated them 3-1 to win the Canadian National Senior "AAA" crown. In the 2008 off-season, Major League Hockey ran into some issues. The
Windsor St. Clair Saints, the league's only college team, walked away from the league. The
Tillsonburg Vipers have officially left the league, as they have applied for expansion into the independent
Western Ontario Athletic Association Senior Hockey League. The
Petrolia Squires are stranded far away from Brantford and Dundas and have also been accepted into the
Western Ontario Athletic Association Senior Hockey League. In the EOSHL, the
Frankford Huskies and
Marmora Lakers have walked away as well. Major League Hockey merged with the
Eastern Ontario Senior Hockey League in 2008, when AAA-level senior hockey in the OHA shrunk to only five teams. In 2011, the league changed its name to
Allan Cup Hockey. In 2015, two new teams were added: the
Hamilton Steelhawks and the
Thorold Athletics. Former OHA president
Brent Ladds served as the commissioner of Allan Cup Hockey from 2013 to 2016. In 2017, the league announced that the
Thorold Athletics were taking leave for the 2018-19 season. For the 2019-20 season, the
Stoney Creek Generals franchise relocated and merged with the
Brantford Blast. The Blast was sold to the owners of the Generals in 2018 and was on leave for the 2018-19 season. For the 2020-21 ACH season, the
Whitby Dunlops announced a leave of absence, and the Caledon Crusaders were added as an expansion team. It was then announced that the season would be cancelled entirely. The league returned to action in 2022 with an 8-game schedule. In 2022, the
Brantford Blast announced that it would not take part in the 2022–23 season. In 2023, the team announced that it did not plan to return to the league citing a lack of competition. The Brampton Buccaneers ceased operations during the 2023–24 season. In 2023, the Hamilton Steelers folded and the
Stoney Creek Tigers joined as an expansion team. In 2025, the league expanded to five clubs with the formation of the
Cambridge Hornets and the
St. Catharines Saints. ==League champions==