Chief Constable of the Ontario Provincial Police

The Chief Constable is the highest-ranking sworn constable (police officer of the Ontario Provincial Police (OPP), the law enforcement agency of Ontario, the most populous of Canada's 13 provinces. The Chief Constable is appointed by and answers to the Attorney General of Ontario, via the Attorney General's Police and Crime Commissioner (PCC). There is no set term limit for the Chief Constable of the OPP, although a new Chief Constable can be appointed following the election of a new government and/or the replacement of the Attorney General.

Much of the Chief Constable's routine responsibilities are delegated to the Deputy Chief Constable, allowing the Chief Constable to attend various events and promotions as well as other political matters deemed important enough for the presence of the Chief Constable. In the event of the Chief Constable's death or incapacitation, the Deputy Chief Constable becomes Acting Chief Constable until the appointment of a new permanent Chief Constable by the Attorney General.

Chief Constable and Deputy Chief Constable are the only ranks within the OPP which may each be held by only one individual at a time; the remaining lower ranks may be held by multiple individuals, such as the current roster of 11 Assistant Chief Constables (ACCs) or 38 Chief Superintendents, with generally a larger number of constables the lower the rank.