- Darwin, Charles Robert (1809-1882)
- Davies, Julian E. (1932- )
- Dengue Fever
- Desiccation
- d'Héeelle, Félix (1873-1949)
- Diatoms
- Dictyostelium
- Dilution Theory and Techniques
- Dinoflagellates
- Diphtheria
- Disinfection and Disinfectants
- Disposal of Infectious Microorganisms
- DNA Chips and Microarrays
- DNA (Deoxyribonucleic Acid)
- DNA Hybridization
- Donnan Equilibrium
- Donnan, Frederick George (1870-1956)
- Doolittle, W. Ford (1942- )
- Dubos, René (1901-1982)
- Dysentery
