Hockey Eastern Ontario is one of the thirteen Branches of Hockey Canada, and along with the Ontario Hockey Federation and Hockey Northwestern Ontario, it is one of the three branches in Ontario.
Formerly known as the Ottawa District Hockey Association, Hockey Eastern Ontario is the governing body of amateur hockey in Eastern Ontario. As defined in more detail in the HEO Constitution and By-Laws:
- Hockey Eastern Ontario is the governing body of Amateur Hockey within its defined boundaries. It shall be composed of amateur hockey teams, of amateur hockey leagues, and of amateur hockey associations which are within the geographical jurisdication of the association and which are willing to comply with the By-Laws, with the Regulations and with the rules of the ODHA.
- Hockey Eastern Ontario shall have jurisdiction over that part of Ontario lying east of and including the Counties of Lanark, Renfrew, and all of Leeds except the town of Gananoque and the portion west of Highway No. 32, and south of Highway No. 15 in the Province of Ontario.