Doona gardneri is a species of flowering plant in the family Dipterocarpaceae. It is a tree endemic to Sri Lanka. It is commonly known as red doon in English and rath dun in Sinhalese. It is a large tree native to lower montane rain forest, where it prefers deep, well-drained soils. It grows in disjunct subpopulations at Ensalwatta, Adam's Peak, and Loolkandura at about 1,000 meters elevation.