The Executive Council of Ontario, often informally referred to as the Cabinet of Ontario, is the cabinet of the Canadian province of Ontario. It comprises ministers of the provincial Crown, who are selected by the premier of Ontario and appointed by the lieutenant governor. The activities of the Government of Ontario are directed by the Executive Council.

The premier of Ontario is the head of government of Ontario. Under the Westminster system, the premier governs with the confidence of a majority the elected Legislative Assembly; as such, the premier typically sits as a member of Provincial Parliament (MPP) and leads the largest party or a coalition of parties. As first minister, the premier selects ministers to form the Executive Council, and serves as its chair. Constitutionally, the Crown exercises executive power on the advice of the Executive Council, which is collectively responsible to the legislature.