China 
Africa 
- Double helix
- Double hull
- Double inverted pendulum
- Double junction
- Double lattice
- Double layer
- Double layer forces
- Double minutes
- Double negation
- Double pendulum
- Double precision
- Double salts
- Double tees
- Double torus
- Double wishbone
- Double wishbone suspension
- Double-blind
- Double-clad fiber
- Double-ended queue
- Double-layer capacitance
- Double-skin facades
- Double-slit experiment
- Double-spending
- Doublesex
- Doublet state
- Doubling
- Doubling time
- Doubly ionized oxygen
- Doubly labeled water
- Doubly linked list
- Doubly stochastic matrix
- Doubtful Sound
- Dougong
- Dove prism
- Dowel
- Dowel bar retrofit
- Down syndrome
- Downcutting
- Downcycling
- Downforce
- Downhole heat exchanger
- Downlink
- Downsampling
- Downsizing
- Downspout
- Downstream
- Downstream processing
- Downtime
- Downwash
- Doxastic logic
- Dozen
- Drag
- Drag coefficient
- Drag crisis
- Drag equation
- Drag link
- Drag reducing agent
- Dragline
- Dragon kiln
- Drain
- Drainage
- Drainage basin
- Drainage density
- Drainage divide
- Drainage gradient
- Drainage system
- Drainage tile
- Drainage tunnel
- Draize test
- Draw
- Drawbar pull
- Drawdown
- Drawer
- Drawing
- Drawing tower
- Drayage
- Drazin inverse
- Dredging
- Drift
- Drift current
- Drift ice
- Drift velocity
- Drift waves
- Drill
- Drill bit
- Drill collar
- Drill cuttings
- Drill pipe
- Drill string
- Drilling
- Drilling and blasting
- Drilling engineering
- Drilling fluid
- Drilling fluid invasion
- Drilling rigs
- Drilling riser
- Drinking
- Drinking fountains
- Drinking water
- Drinking water quality standards
- Drive by wire
- Drive shaft
- Drive wheels
- Drive-by download
- Driven element
- Driven right leg circuit
- Driver drowsiness detection
- Driver monitoring system
- Driver scheduling problem
- Drivetrain
- Driving cycle
- Driving licence
- Driving simulators
- Drooling
- Drools
- Drop impact
- Drop point
- Drop size distribution
- Drop structure
- Drop test
- Drop tower
- Drop tube
- Droplet nuclei
- Droplet-based microfluidics
- Droplets
- Dropping funnel
- Dropping point
- Drops
- Dropstones
- Dropwise condensation
- Dross
- Drought
- Drucker stability
- Drude model
- Drug
- Drug allergy
- Drug carriers
- Drug delivery
- Drug delivery to the brain
- Drug design
- Drug development
- Drug discovery
- Drug injection
- Drug metabolism
- Drug overdose
- Drug packaging
- Drug permeability
- Drug repositioning
- Drug repurposing
- Drug resistance