The following is a list of secondary schools in Ontario. Secondary education policy in the Canadian province of Ontario is governed by the Ministry of Education. Secondary education in Ontario includes Grades 9 to 12. The following list includes public secular institutions, public separate schools, and privately managed independent schools in Ontario. All public schools in Ontario (secular and separate) operate as a part of either an English first language school board or a French first language school board.
Although Ontario's secular and separate school systems are both considered public, colloquially the term public school typically distinguishes a secular institution from its separate counterparts: institutions operated by a public secular school board are typically referred to as public schools, whereas institutions operated by a public separate school board are typically referred to as Catholic schools.
Public secular secondary schools may operate under a number of designations, including collegiate institute, école secondaire, high school, and secondary school. Public separate secondary schools are typically named academy, Catholic high school, Catholic secondary school, college school or école secondaire catholique.
Algoma District
English public
French public
École secondaire l'Orée des Bois, Dubreuilville
Villa Française des Jeunes, Elliot Lake
English Catholic
Holy Angels Learning Centre, Sault Ste. Marie
St. Mary's College, Sault Ste. Marie
French Catholic
École secondaire catholique Jeunesse-Nord, Blind River
École secondaire Notre-Dame-du-Sault, Sault Ste. Marie
École secondaire Saint-Joseph, Wawa
Brant County
English public
English Catholic
Assumption College School, Brantford
St. John's College, Brantford
Bruce County
English public
English Catholic
Sacred Heart High School, Walkerton
Municipality of Chatham-Kent
English public
English Catholic
Ursuline College, Chatham
French Catholic
École secondaire catholique de Pain Court, Pain Court
Cochrane District
English public
French public
École secondaire l'Alliance, Iroquois Falls
École Publique Renaissance, Timmins
English Catholic
O'Gorman High School, Timmins
French Catholic
Private
Delores D. Echum Composite School, Moose Factory
Dufferin County
English public
Centre Dufferin District High School, Shelburne
Orangeville District Secondary School, Orangeville
Smiths Falls District Collegiate Institute, Smiths Falls
English Catholic
Notre Dame Catholic High School, Carleton Place
St. John Catholic High School, Perth
St. Luke Catholic High School, Smiths Falls
Leeds and Grenville United Counties
English public
English Catholic
St. Mary Catholic High School, Brockville
St. Michael Catholic High School, Kemptville
French Catholic
Académie catholique Ange Gabriel, Brockville
Lennox and Addington County
English public
Ernestown Secondary School, Odessa
Napanee District Secondary School, Napanee
North Addington Education Centre (K-12), Cloyne
Manitoulin District
English public
Manitoulin Secondary School, M'Chigeeng
Middlesex County
English public
French public
École secondaire Gabriel-Dumont, London
English Catholic
French Catholic
École secondaire catholique Monseigneur-Bruyère, London
District Municipality of Muskoka
English public
Bracebridge and Muskoka Lakes Secondary School, Bracebridge
Gravenhurst High School, Gravenhurst
Huntsville High School, Huntsville
English Catholic
St. Dominic School, Bracebridge
Norfolk County
English public
English Catholic
Holy Trinity Catholic High School, Simcoe
Sprucedale Secondary School, Simcoe (for youth held in secure custody at Sprucedale Youth Centre, operated under contract from the Ministry of Children, Community and Social Services)
Northumberland County
English public
English Catholic
St. Mary's Secondary School, Cobourg
Regional Municipality of Niagara
English public
French public
École secondaire Confédération, Welland
English Catholic
French Catholic
École secondaire catholique Saint Jean de Brébeuf, Welland