Ontario Basketball is the sport governing body for basketball in the Province of Ontario. Created nearly 70 years ago as the Ontario Amateur Basketball Association, the organization is a not-for-profit association and was incorporated as such in 1977.

Ontario Basketball represents the province of Ontario's amateur basketball interests. The membership is made up of athletes, coaches, officials, members clubs, camps, local basketball organizations, groups, leagues and basketball supporters. As part of its mandate, Ontario Basketball is committed to working with the Toronto Raptors Basketball Club and NBA Canada to further promote and develop amateur basketball in the province.

Ontario Basketball has a sound governance model and is directed by a volunteer Board of Directors who are elected by the membership to represent, guide, govern and manage the affairs of the association. The professional staff, under the guidance of the Executive Director, manages the daily administrative operations of Ontario Basketball.

Ontario Basketball is a member of Canada Basketball and operates in affiliation with other basketball delivery agencies to provide basketball programs in Ontario, namely: