Engineering
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- Hallade methodThe Hallade method, devised by Frenchman Emile Hallade, is a method used in track geometry
- Hanford Engineer WorksFormer American nuclear production complex
- Hard infrastructurePhysical components of roads etc
- HardnessMeasure of a material's resistance to localized plastic deformation
- Hardware architectureIn engineering, hardware architecture refers to the identification of a system's physical
- Hardy CrossAmerican structural engineer (1885–1959)
- Harold KerznerAmerican engineer and management consultant
- Harrison MutikangaUgandan civil engineer and academic
- Hele-Shaw clutchThe Hele-Shaw clutch was an early form of multi-plate wet clutch, in use around 1900. It w
- Henry Harbinson SinclairHenry Harbinson Sinclair (1858–1914) was a pioneer of the hydro-electric industry in the U
- Henry Roe CampbellAmerican surveyor and civil engineer
- Hex keyDriver for hexagonal socketed bolts or screws
- Hierarchical database modelTree-like structure for data
- High-speed steam engineSteam engine designed to run at comparatively high speed
- HobbingProcess used to cut teeth into gears
- Hood (car)The hood (American English) or bonnet (Commonwealth English) is the hinged cover over the
- Horseshoe Curve (Pennsylvania)Rail curve in Altoona, Pennsylvania
- Human powerWork or energy produced from the human body
- Human-powered transportTransport of goods and/or people only using human muscles
- Hydraulic fluidMedium to transfer power in hydraulic machinery
- Hydraulic pumpMechanical power source
- Hydro-Québec's electricity transmission systemInternational power transmission system centred in Quebec, Canada
- Hydrogen embrittlementReduction in ductility of a metal exposed to hydrogen
- HydronicsHydronics (from Ancient Greek hydro- 'water') is the use of liquid water or gaseous water
- HyperloopProposed mode of passenger and freight transportation