DCHS
- Alnwick
- Danville Community High School
- Daughters of Charity Health System
- Davao Christian High School
- David Crockett High School (Tennessee)
- Davie County High School
- Daviess County High School
- Dawson County High School (Dawsonville, Georgia)
- DeKalb County High School
- Deans Community High School
- Decatur Central High School
- Deep Creek High School
- Deep Creek Hot Springs
- Del City High School
- Delta Charter High School
- Denver City High School (Texas)
- Desales Catholic High School (Walla Walla, Washington)
- Dickinson County Healthcare System
- Divine Child High School
- Dodge City High School
- Dodge County High School
- Dougherty Comprehensive High School
- Douglas County High School (Colorado)
- Douglas County High School (Douglasville, Georgia)
- Douglas County High School (Nevada)
- Douglas County Historical Society
- Dowling Catholic High School
- Dr Challoner's High School
- Drew Central High School
- Drummond Community High School
- Dundee-Crown High School
- Dyer County High School
- Livingston, West Lothian
- Northumberland
- Order of the Holy Sepulchre (Catholic)
- The Duchess's Community High School