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- Magherafelt High School, Magherafelt, County Londonderry
- Malone College, Belfast
- Markethill High School, Markethill, County Armagh
- Massereene Community College, Antrim, County Antrim
- Monkstown Community School, Newtownabbey, County Antrim
- Mount Gilbert Community College, Belfast
- Movilla High School, Newtownards, County Down
- Loreto Grammar School, Omagh, County Tyrone
Read more about this topic: List Of Secondary Schools In Northern Ireland