D
- De La Salle Secondary School, Downpatrick, County Down
- Dean Brian Maguirc College, Carrickmore, County Tyrone
- Devenish College, Enniskillen, County Fermanagh
- Dominican College, Portstewart, County Londonderry
- Down Academy, Downpatrick, County Down
- Down High School, Downpatrick, County Down
- Downshire School, Carrickfergus, County Antrim
- Dromore High School, Dromore, County Down
- Drumcree College, Portadown, County Armagh
- Drumglass High School, Dungannon, County Tyrone
- Drumragh Integrated College, Omagh, County Tyrone
- Dunclug College, Ballymena, County Antrim
- Dundonald High School, Belfast
- Dunluce School, Bushmills, County Antrim
- Dunmurry High School, Belfast
Read more about this topic: List Of Secondary Schools In Northern Ireland