Hockey Eastern Ontario (HEO), formerly the Ottawa District Hockey Association, is the governing body of a variety of ice hockey Junior leagues and a minor hockey system based out of the Greater Ottawa area and Southwestern Quebec. It is one of thirteen regional branches of Hockey Canada. The ODHA became HEO in the Summer of 2013.
The roots of Hockey Eastern Ontario date back to the 1890s. In 1890, the Ontario Hockey Association was organized and a senior league was formed. At the same time, the Ottawa City Hockey League was organized. In 1894, the Ottawa Hockey Association, owners of the senior Ottawa Hockey Club and organizer of the OCHL resigned from the OHA over a dispute over the Cosby Cup. Several organizations came and went over the next twenty years, such as the Eastern Ontario Hockey Association, and the Central Canada Hockey Association for teams in Eastern Ontario. Teams also played in leagues with Quebec teams. In 1920, the Ottawa and Valley branch of the Amateur Athletic Union of Canada was formed. It eventually became the Ottawa District Hockey Association.