China 
Africa 
- Dithizone
- Dityrosine
- Diuresis
- Diuretics
- Diurnal
- Diurnal cycle
- Diuron
- Divalent
- Divergence
- Divergence theorem
- Divergent series
- Divergent thinking
- Diversion dam
- Diversity combining
- Diversity factor
- Diversity gain
- Diversity schemes
- Diverticulosis
- Divertor
- Divided differences
- Diving reflex
- Divinyl ether
- Divinylbenzene
- Divisibility
- Division
- Division algebras
- Division of labor
- Division of labour
- Division ring
- Division sign
- Dixanthogen
- Django
- Djurleite
- Dlib
- Do while loop
- DoDAF
- DoG
- Doc
- Docetaxel
- Docker
- Docking
- Docking station
- Docks
- Docosahexaenoic acid
- Doctor-patient relationship
- Document
- Document automation
- Document classification
- Document clustering
- Document management
- Document processing
- Document retrieval
- Document-oriented database
- Document-term matrix
- Documentation
- Docusate
- Dodecahedron
- Dodecane
- Dodecanol
- Dodecylbenzene
- Dog clutch
- Dogger Bank Wind Farm
- Doherty amplifier
- Dolerite
- Dolomite
- Dolomitization
- Domain
- Domain adaptation
- Domain analysis
- Domain controller
- Domain decomposition method
- Domain decomposition methods
- Domain engineering
- Domain model
- Domain name
- Domain of a function
- Domain of discourse
- Domain theory
- Domain walls
- Domain-driven design
- Domain-specific modeling
- Domes
- Domestic robot
- Dominance
- Dominance-based rough set approach
- Dominating set
- Domino logic
- Domoic acid
- Dongles
- Donnan potential
- Donor number
- Door
- Door closer
- Door handle
- Dopachrome
- Dopamine
- Dopamine agonists
- Dopamine antagonists
- Dopamine receptors
- Dopamine transporter
- Dopaminergic neurons
- Dopaquinone
- Doped
- Doping
- Doppler cooling
- Doppler echocardiography
- Doppler effect
- Doppler radar
- Doppler ultrasonography
- Doppler ultrasound
- Dorsal attention network
- Dorsal column
- Dorsal horn
- Dorsal motor nucleus
- Dorsal root
- Dorsal root ganglia
- Dorsal root ganglion
- Dorsalis pedis artery
- Dorsolateral prefrontal cortex
- Dorsomedial prefrontal cortex
- Dorsum
- Dosage form
- Dose
- Dose area product
- Dose fractionation
- Dose profile
- Dose rate
- Dose-volume histogram
- Dosimeters
- Dosimetry
- Dosing
- Dot blot
- Dot matrix
- Dot matrix printers
- Dot product
- Dot-com
- Dota-tate
- Dotatoc
- Dots
- Double
- Double binds
- Double bond
- Double bottom
- Double cone
- Double coset
- Double counting
- Double diamond
- Double diffusive convection
- Double factorial
- Double glazing