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The Attorney General of Ontario (French: Procureur général de l'Ontario) is the chief legal adviser to Her Majesty the Queen in Right of Ontario and, by extension, the Government of Ontario. The Attorney General is a senior member of the Executive Council of Ontario (the cabinet) and oversees the Ministry of the Attorney General – the department responsible for the oversight of the justice system in the province of Ontario. The Attorney General is an elected Member of Provincial Parliament who is appointed by the Lieutenant Governor of Ontario on the constitutional advice of the Premier of Ontario.

The goal of the Ministry of the Attorney General is to provide a fair and accessible justice system which reflects the needs of the diverse communities it serves across government and the province. The Ministry represents the largest justice system in Canada and one of the largest in North America. It strives to manage the justice system in an equitable, affordable and accessible way throughout the province.

Doug Downey was appointed Attorney General of Ontario on 20 June 2019, replacing Caroline Mulroney. Lindsey Park is Parliamentary Assistant to the Attorney General.