- Electron mobility
- Electron shell
- Electron transfer
- Electron-beam lithography
- Electron-beam processing
- Electron-beam welding
- Electronegativity
- Electronic oscillators
- Electronic parking brake
- Electronic waste
- Electronics industry
- Electronvolt
- Electrophiles
- Electrophysiology
- Electropolishing
- Electrospray ionization
- Electrostatic
- Electrostatic precipitator
- Electrostriction
- Electrosurgery
- Electrosynthesis
- Electrowetting
- Electrowinning
- Elektron
- Elemental analysis
- Elementary charge
- Elevation
- Elevators
- Ellipses
- Elliptic orbit
- Elution
- Embankment
- Embankment dam
- Embodied energy
- Embrittlement
- Emerald
- Emergency management
- Emery
- Emission intensity
- Emission spectrum
- Emissivity
- Empennage
- Empirical formula
- Emulsion polymerization
- Emulsions
- Enantiomeric excess
- Enantiomers
- Encryption
- End group
- Endcapping
- Endmember
- Endocrine glands
- Endophytes
- Endorheic basin
- Endoscopy
- Endothelial
- Endothelial progenitor cells
- Endothermic gas
- Endothermic process
- Energy budget
- Energy density
- Energy economics
- Energy efficiency in transport
- Energy flux
- Energy levels
- Energy release rate
- Energy storage
- Engine
- Engine block
- Engine knocking
- Engineered cementitious composite
- Engineered stone
- Engineered wood
- Engineering geology
- Engraving
- Enhanced coal bed methane recovery
- Enriched uranium
- Enteric coating
- Enthalpy
- Enthalpy of fusion
- Enthalpy of sublimation
- Enthalpy of vaporization
- Entrance length
- Entropy
- Entropy production
- Environmental accounting
- Environmental control system
- Environmental degradation
- Environmental effects of aviation
- Environmental factors
- Environmental health
- Environmental impact of concrete
- Environmental science
- Environmental stress cracking
- Enzyme
- Enzyme inhibitor
- Epicenter
- Epichlorohydrin
- Epitaxy
- Epoxides
- Epoxidized soybean oil
- Epoxy
- Epoxy granite
- Epoxy value
- Epsomite
- Equality
- Equation of state
- Equation solving
- Equations of motion
- Equator
- Equilateral triangle
- Equipartition theorem
- Equivalent carbon content
- Equivalent concentration
- Erosion
- Erosion control
- Erosion corrosion
- Erythropoietin
- Escherichia coli
- Esophagus
- Esters
- Estrogen
- Estuary
- Ethane
- Ethanol
- Ethanol fermentation
- Ether
- Ethyl acetate
- Ethyl iodide
- Ethylbenzene
- Ethylene
- Ethylene glycol
- Ethylene oxide
- Ethylenediaminetetraacetic acid
- Ethylmagnesium bromide
- Euclidean geometry
- Euler-Bernoulli beam theory
- Eurasian Plate
- Eurocodes
- European emission standards
- Europium
- Eutectic bonding
- Eutectic system
- Eutrophication
- Evaporation
- Evaporative cooler
- Evaporators
- Evaporites
- Evapotranspiration
- Evolution