China 
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- HTLV
- HTLV-1
- HTM
- HTML
- HTML element
- HTML forms
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- HTP
- HTPB
- HTR-10
- HTR-PM
- HTTP
- HTTPS
- HU
- HUC
- HUD
- HVAC
- HVDC
- HVDC converter
- HVO
- HVPE
- HYMAP
- HYSPLIT
- Haar measure
- Haar wavelet
- Haar-like features
- Haber process
- Hacat
- Hackers
- Hacksaw
- Hacktivism
- Hacktivists
- Hadamard matrix
- Hadamard product
- Hadamard transform
- Hadoop
- Hadronization
- Hadrons
- HaeIII
- Haematopoiesis
- Haematopoietic system
- Haematoxylin
- Haemodynamic response
- Haemophilia
- Haemophilia A
- Haemophilia B
- Haemophilus influenzae
- Hafnium
- Hafnium carbide
- Hafnium diboride
- Hafnium oxide
- Hafnium silicate
- Hafnium tetrachloride
- Haigh diagram
- Haigh-Westergaard stress space
- Hail
- Hair
- Hair analysis
- Hair cells
- Hair follicle
- Hair loss
- Hair removal
- Hairpin
- Hairy root culture
- Halbach array
- Haldane effect
- Half-band filter
- Half-cells
- Half-duplex
- Half-grabens
- Half-integer
- Half-life
- Half-normal distribution
- Half-reaction
- Half-spaces
- Half-value layer
- Halftone
- Halide
- Halite
- Halitosis
- Hall effect
- Hall effect sensors
- Hall-effect thrusters
- Hallmarks of cancer
- Halloysite
- Hallucinations
- Halo orbit
- Haloacetic acids
- Haloalkane dehalogenase
- Haloalkanes
- Haloarchaea
- Halocarbons
- Halochromic
- Haloclines
- Haloform reaction
- Halogen bond
- Halogen lamps
- Halogenation
- Halogens
- Halomethanes
- Halomonadaceae
- Halon
- Halon 1301
- Haloperoxidases
- Halophiles
- Halophilic
- Halorhodopsin
- Halothane
- Halotolerant
- Halting problem
- Halton sequences
- Hamaker constant
- Hamilton's principle
- Hamiltonian
- Hamiltonian Monte Carlo
- Hamiltonian cycle
- Hamiltonian matrix
- Hamiltonian mechanics
- Hamiltonian path
- Hamiltonian path problem
- Hamiltonian system
- Hamiltonian vector field
- Hammer
- Hammer drill
- Hammer mill
- Hamming
- Hamming code
- Hamming distance
- Hamming weight
- Hammond's postulate
- Hamstring
- Hand
- Hand arm vibrations
- Hand drill
- Hand dryers
- Hand eczema
- Hand geometry
- Hand pumps
- Hand sanitizer
- Hand strength
- Hand tools
- Hand tracking
- Hand washing
- Hand-eye coordination
- Handedness
- Handle System
- Handles
- Handling
- Handover
- Handrails