There are numerous 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, , high school, and secondary school. Public separate secondary schools are typically named academy, Catholic high school, Catholic secondary school, college school or .
Algoma District English public
Central Algoma Secondary School, Desbarats Chapleau High School, Chapleau Elliot Lake Secondary School, Elliot Lake Hornepayne High School, Hornepayne Korah Collegiate & Vocational School, Sault Ste. Marie Michipicoten High School, Wawa Superior Heights Collegiate and Vocational School, Sault Ste. Marie W. C. Eaket Secondary School, Blind River White Pines Collegiate & Vocational School, Sault Ste. Marie
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
Brantford Collegiate Institute and Vocational School, Brantford North Park Collegiate and Vocational School, Brantford Paris District High School, Paris Pauline Johnson Collegiate & Vocational School, Brantford Tollgate Technological Skills Centre, Brantford
English Catholic Assumption College School, Brantford St. John's College, Brantford
Bruce County English public
Bruce Peninsula District School, Lion's Head Kincardine & District Secondary School, Kincardine Peninsula Shores District School, Wiarton Saugeen District Secondary School, Port Elgin Walkerton District Community School, Walkerton
English Catholic Sacred Heart High School, Walkerton
Municipality of Chatham-Kent English public
Blenheim District High School, Blenheim Chatham-Kent Secondary School, Chatham John McGregor Secondary School, Chatham Lambton-Kent Composite School, Dresden Ridgetown District High School, Ridgetown Tilbury District High School, Tilbury Wallaceburg District Secondary School, Wallaceburg
English Catholic Ursuline College Chatham, Chatham
French Catholic École secondaire catholique de Pain Court, Pain Court
Cochrane District English public
École Secondaire Cochrane High School, Cochrane Hearst High School, Hearst Iroquois Falls Secondary School, Iroquois Falls Kapuskasing District High School, Kapuskasing Roland Michener Secondary School, South Porcupine Timmins High and Vocational School, Timmins Northern Lights Secondary School, Moosonee
French public École secondaire l'Alliance, Iroquois Falls École Publique Renaissance, Timmins
English Catholic O'Gorman High School, Timmins
French Catholic
École catholique Georges-Vanier, Smooth Rock Falls École catholique Nouveau-Regard, Cochrane École secondaire catholique l'Alliance, Iroquois Falls École secondaire catholique Cité des Jeunes, Kapuskasing École secondaire catholique de Hearst, Hearst École secondaire catholique Thériault, Timmins La Clef, Timmins
Private Delores D. Echum Composite School, Moose Factory
Dufferin County
English public Centre Dufferin District High School, Shelburne Orangeville District Secondary School, Orangeville Westside Secondary School, Orangeville
Regional Municipality of Durham English public
Ajax High School, Ajax Anderson Collegiate Vocational Institute, Whitby Bowmanville High School, Bowmanville Brock High School, Cannington Brooklin High School, Whitby Cedar Valley Secondary School, Oshawa Clarington Central Secondary School, Bowmanville Clarke High School, Newcastle Courtice Secondary School, Courtice Donald A. Wilson Secondary School, Whitby Dunbarton High School, Pickering Durham Alternative Secondary School, Oshawa Eastdale Collegiate and Vocational Institute, Oshawa G. L. Roberts Collegiate and Vocational Institute, Oshawa Henry Street High School, Whitby J. Clarke Richardson Collegiate, Ajax Maxwell Heights Secondary School, Oshawa O'Neill Collegiate and Vocational Institute, Oshawa Pickering High School, Ajax Pine Ridge Secondary School, Pickering Port Perry High School, Port Perry R. S. McLaughlin Collegiate and Vocational Institute, Oshawa Sinclair Secondary School, Whitby Uxbridge Secondary School, Uxbridge
English Catholic
All Saints Catholic Secondary School, Whitby Archbishop Denis O'Connor Catholic High School, Ajax Father Leo J. Austin Catholic Secondary School, Whitby Holy Trinity Secondary School, Courtice Monsignor John Pereyma Catholic Secondary School, Oshawa Monsignor Paul Dwyer Catholic High School, Oshawa Notre Dame Catholic Secondary School, Ajax St. Mary Catholic Secondary School, Pickering St. Stephen's Secondary School, Bowmanville
French Catholic École secondaire catholique Saint-Charles-Garnier, Whitby
French public École secondaire Ronald-Marion, Pickering
Private Trafalgar Castle School, Whitby Kingsway College, Oshawa
Elgin County English public
Central Elgin Collegiate Institute, St. Thomas East Elgin Secondary School, Aylmer Parkside Collegiate Institute, St. Thomas West Elgin Secondary School, West Lorne
English Catholic St. Joseph's Catholic High School, St. Thomas
Essex County and Windsor English public
Belle River District High School, Belle River Essex District High School, Essex Kennedy Collegiate Institute, Windsor Kingsville District High School, Kingsville Leamington District Secondary School, Leamington North Star High School, Amherstburg Riverside Secondary School, Windsor Sandwich Secondary School, LaSalle Tecumseh Vista Academy Secondary School, Tecumseh Vincent Massey Secondary School, Windsor W. F. Herman Academy Secondary School, Windsor Walkerville Collegiate Institute, Windsor Westview Freedom Academy (formerly named Century Secondary School), Windsor
French public École secondaire de Lamothe-Cadillac (formerly named École secondaire Michel-Gratton), Windsor
English Catholic
Assumption College School, Windsor Cardinal Carter Catholic High School, Leamington Catholic Central High School, Windsor F. J. Brennan Catholic High School, Windsor Holy Names High School, Windsor St. Anne Catholic High School, Lakeshore St. Joseph's Catholic High School, Windsor St. Michael's Alternative High School, Essex and Windsor St. Thomas of Villanova Catholic Secondary School, LaSalle
French Catholic École secondaire catholique E. J. Lajeunesse, Windsor École secondaire catholique l'Essor, Tecumseh
Frontenac County English public
Bayridge Secondary School, Kingston Frontenac Secondary School, Kingston Kingston Secondary School, Kingston La Salle Secondary School, Kingston Loyalist Collegiate and Vocational Institute, Kingston Limestone School of Community Education, Kingston Granite Ridge Education Centre, Sharbot Lake Sydenham High School, Sydenham
French public École secondaire publique Mille-Îles, Kingston
English Catholic Holy Cross Catholic Secondary School, Kingston Regiopolis-Notre Dame Catholic Secondary School, Kingston
French Catholic École secondaire catholique Marie-Rivier, Kingston
Grey County English public Georgian Bay Community School, Meaford Grey Highlands Secondary School, Flesherton John Diefenbaker Secondary School, Hanover Owen Sound District Secondary School, Owen Sound
English Catholic St. Mary's High School, Owen Sound
French Catholic École secondaire catholique Saint-Dominique-Savio, Owen Sound
Haldimand County English public Cayuga Secondary School, Cayuga Dunnville Secondary School, Dunnville Hagersville Secondary School, Hagersville McKinnon Park Secondary School, Caledonia
Haliburton County English public Haliburton Highlands Secondary School, Haliburton
Regional Municipality of Halton English public
Abbey Park High School, Oakville Acton District High School, Acton Aldershot High School, Aldershot Burlington Central High School, Burlington Craig Kielburger Secondary School, Milton Dr. Frank J. Hayden Secondary School, Burlington Elsie MacGill Secondary School, Milton Garth Webb Secondary School, Oakville Georgetown District High School, Georgetown Iroquois Ridge High School, Oakville M. M. Robinson High School, Burlington Milton District High School, Milton Nelson High School, Burlington Oakville Trafalgar High School, Oakville T. A. Blakelock High School, Oakville White Oaks Secondary School, Oakville
French public École secondaire Gaétan Gervais, Oakville
English Catholic
Assumption Catholic Secondary School, Burlington Bishop Paul Francis Reding Catholic Secondary School, Milton Christ the King Catholic Secondary School, Georgetown Corpus Christi Catholic Secondary School, Burlington Holy Trinity Catholic Secondary School, Oakville Notre Dame Catholic Secondary School, Burlington St. Francis Xavier Catholic Secondary School, Milton St. Ignatius of Loyola Catholic Secondary School, Oakville St. Kateri Tekakwitha Catholic Secondary School, Milton St. Thomas Aquinas Catholic Secondary School, Oakville
French Catholic École secondaire catholique Sainte-Trinité, Oakville
Private Appleby College, Oakville St. Mildred's-Lightbourn School, Oakville King's Christian Collegiate, Oakville
Hamilton English public
Ancaster High School, Ancaster Bernie Custis Secondary School, Hamilton Dundas Valley Secondary School, Dundas Glendale Secondary School, Hamilton Nora Frances Henderson Secondary School, Hamilton Orchard Park Secondary School, Stoney Creek Saltfleet District High School, Stoney Creek Sherwood Secondary School, Hamilton Sir Allan MacNab Secondary School, Hamilton Sir Winston Churchill Secondary School, Hamilton Waterdown District High School, Waterdown Westdale Secondary School, Hamilton Westmount Secondary School, Hamilton
French public École secondaire Georges-P.-Vanier, Hamilton
English Catholic
Bishop Ryan, Hamilton Bishop Tonnos, Ancaster Cathedral High School, Hamilton Good Shepherd Hamilton, Downtown Hamilton St. Jean de Brebeuf Secondary School, Hamilton St. John Henry Newman, Stoney Creek St. Mary Catholic Secondary, Hamilton St. Thomas More, Hamilton
French Catholic École secondaire Académie catholique Mère-Teresa, Hamilton
English private Columbia International College, Westdale Hamilton District Christian High School, Ancaster Hillfield Strathallan College, West Mountain Hamilton Southern Ontario College, Downtown Hamilton
Hastings County English public
Bayside Secondary School, Belleville Centennial Secondary School, Belleville Centre Hastings Secondary School, Madoc Eastside Secondary School, Belleville (formerly Moira) North Hastings High School, Bancroft Trenton High School, Trenton
French public École secondaire publique Marc-Garneau, Trenton
Private (independent)
Albert College (Pre-Kindergarten to Grade 12), Belleville
English Catholic/Christian Nicholson Catholic College, Belleville Quinte Christian High School, Belleville St. Paul Catholic Secondary School, Trenton St. Theresa Catholic Secondary School, Belleville
First Nations Private Ohahase Education Centre, Tyendinaga Mohawk Territory
Huron County English public