Herbert Thomas Dicksee was an English painter who specialised in oil paintings of dogs, particularly the deerhound
Felix Anton Dohrn was a prominent German Darwinist and the founder and first director of the first zoological research station in the world, the Stazione Zoologica in Naples, Italy.
Paul Belloni Du Chaillu was a French-American traveller, zoologist and anthropologist. He became famous in the 1860s as the first modern European to confirm the existence of gorillas
Wynfrid Lawrence Henry Duckworth was a British anatomist and former Master of Jesus College Cambridge. The Duckworth Laboratory (Department of Biological Anthropology) at Cambridge University is named after him
James Duff, 5th Earl Fife, was a Scottish nobleman and politician
Peter Martin Duncan was an English Palaeontologist. He was a Fellow of the Zoological Society of London, holding office in the Society