China 
Africa 
- Inscribed sphere
- Insect flight
- Insect repellents
- Insensitive munitions
- Insertion devices
- Insertion gain
- Insertion loss
- Insertion reactions
- Insertion sequence
- Insertion sort
- Insider threat
- Inspection
- Inspection in manufacturing
- Instability
- Instability index
- Installation
- Installer
- Instance selection
- Instance variable
- Instance-based learning
- Instant centre of rotation
- Instant coffee
- Instant messaging
- Instant-on
- Instantaneous frequency
- Instantons
- Instruction list
- Instruction pipeline
- Instruction register
- Instruction set
- Instructional design
- Instrument amplifier
- Instrument approach
- Instrument error
- Instrument transformer
- Instrumental analysis
- Instrumentation
- Instrumentation amplifier
- Instruments
- Insufflation
- Insula
- Insular cortex
- Insulated glazing
- Insulating Concrete Form
- Insulation
- Insulation system
- Insulators
- Insulin
- Insulin glargine
- Insulin pumps
- Insulin receptor
- Insulin receptor substrate
- Insulin-like growth factor
- Insulin-like growth factor 1
- Insulin-like growth factor 1 receptor
- Insulin-like growth factor 2
- Insulinoma
- Insult
- IntServ
- Intact forests
- Intake
- Intake manifold
- Intake tower
- Intangible assets
- Integer factorization
- Integer lattice
- Integer overflow
- Integer programming
- Integer sequences
- Integer-valued function
- Integers
- Integrable systems
- Integral
- Integral curves
- Integral domains
- Integral equations
- Integral geometry
- Integral imaging
- Integral length scale
- Integral membrane proteins
- Integral nonlinearity
- Integral operator
- Integral transforms
- Integral windup
- Integrase
- Integrase inhibitors
- Integrated Risk Information System
- Integrated assessment model
- Integrated design
- Integrated encryption scheme
- Integrated logistics support
- Integrated passive devices
- Integrated project delivery
- Integrating factors
- Integrating sphere
- Integration by parts
- Integration by substitution
- Integrative thinking
- Integrator
- Integrins
- Integrity
- Integro-differential equation
- Integrons
- Integument
- Integumentary system
- Inteins
- Intel 4004
- Intel Core
- Intel Core 2
- Intel Edison
- Intel IPSC
- Intel Paragon
- Intellectual disability
- IntelliJ IDEA
- Intelligence
- Intelligence amplification
- Intelligent agents
- Intelligent automation
- Intelligent control
- Intelligent decision support system
- Intelligent decision support systems
- Intelligent lighting
- Intelligent maintenance system
- Intelligent pump
- Intelligent sensor
- Intelligent tutoring system
- Intelligibility
- Intensity
- Intensity interferometer
- Intensity measure
- Intensity modulation
- Intensity-duration-frequency curve
- Intensive care
- Intensivists
- Intention tremor
- Intentionality
- Inter-cell interference coordination
- Inter-rater reliability
- Inter-server
- InterPlanetary File System
- Interact
- Interaction
- Interaction design
- Interaction energy
- Interaction picture
- Interaction protocol
- Interaction techniques
- Interactive communication
- Interactive computation
- Interactive computing