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- Dielectric reflector
- Diesel engine
- Diesel generator set
- Diesel oil
- Difference in Time Of Arrival (DTOA)
- Differential Omega
- Differential relay
- Differential system
- Differentiator
- Diffraction
- Diffraction (2)
- Diffraction region
- Diffuse Reflection
- Diffuse Transmission
- Diffuser
- Diffusion
- Diffusion Factor
- Digit
- Digital-analogue convertor
- Digital computer
- Digital data
- Digitize
- Dihedral reflector
- Dike
- Dike (2)
- Dilution of precision (DOP)
- Dioptric
- Dip
- Dipole
- Direct-current generator
- Direct-current machine
- Direct-current motor
- Direct coupling
- Direct on-line starting (of a motor) (G.B.)
- Direct wave
- Direction Light
- Direction Light (2)
- Direction finder
- Direction finding - radio
- Direction finding network
- Direction finding site
- Directional antenna
- Directional gain
- Directional pattern
- Directivity
- Directivity factor
- Directly controlled variable
- Disability Glare
- Discharge
- Discharge Lamp
- Discharge Lamp/es
- Discomfort Glare
- Disconnector
- Discontinuation
- Dispersion
- Display
- Display (2)
- Display factor
- Distance finding station
- Distance resolution
- Distance root mean square (dRMS)
- Distant site error
- Distortion
- Distribution Temperature
- Distribution box
- Distribution cubicle
- Distribution network
- Distribution of electric energy
- Distributor
- Disturbance
- Dither
- Diver
- Diverged Beam
- Diversity factor
- Diversity reception
- Diverted Beam
- Diverting Prism
- Diving bell
- Docking Signals
- Dog
- Dog step
- Dolphin
- Dolphins
- Dominant Wavelength
- Door frame
- Door leaf
- Dot element
- Double sideband transmission (DSB)
- Double topping lift
- Douglas Lamp (G.B.)
- Dovetail
- Dowel
- Down lead
- Down time
- Drain
- Drainpipe
- Dredging
- Drift circle
- Drift circle radius
- Drilling
- Drip
- Drip-protected enclosure (or machine)
- Driven length (of a pile)
- Driving resistance (of a pile)
- Dropping
- Drum Lens
- Dry Dock
- Dry cell
- Duckboards
- Duplex (2)
- Duty
- Duty (of a machine or apparatus)
- Duty factor (of a machine or apparatus)
- Dwarf wall
- Dye
- Dynamic load
- E-Navigation
- ELoran
- Earth conductor
- Earth electrode
- Earth system
- Earthed neutral system
- Earthing conductor
- Earthing switch
- Earthworks
- Easily recognizable structure
- Echo box
- Echoing area
- Echoing volume
- Eclipse
- Eddy
- Educational organizations management system (EOMS)
- Effective Intensity
- Effective acoustic centre
- Effective height (G.B.)
- Effective height (U.S.A.)
- Effective length
- Effective radiated power
- Effective radius of the earth
- Effective range
- Efficiency of a sound source
- Elasticity
- Electric detonator
- Electric field
- Electric field strength
- Electric generator
- Electric installation
- Electric motor
- Electrical centre
- Electrical distance
- Electrical scanning
- Electrochemical cell
- Electrode
- Electrode (2)
- Electrode (3)
- Electrodynamic emitter - Diaphragm assembly
- Electrodynamic emitter - Diaphragm suspension
- Electrodynamic emitter - Driver
- Electrodynamic emitter - Moving coil
- Electroluminescence
- Electroluminescence/es
- Electrolyte
- Electromagnetic horn
- Electromagnetic horn - Armature
- Electromagnetic horn - Coil
- Electromagnetic waves
- Electronic position indicator
- Electronic switching device
- Electroplating
- Elevated duct
- Elevation of Light
- Elliptically polarized wave
- Embankment
- Emergency Alarm
- Emergency Light
- Emergency apparatus
- Emergency battery
- Emergency generator set
- Emulsion paint
- Encoder
- End-of-charge voltage
- End bearing pile
- End fire array
- End point voltage (G.B.)
- Energy consumption
- Engine room
- Ensemble of aids to marine navigation
- Enter a narrow channel
- Entonite
- Entrance
- Entrance floor
- Epoxy paint
- Equalising charge
- Equality of Laudness
- Equi-Angular Lens
- Equi-Angular Profile
- Equiphase zone
- Equipotential bonding
- Erosion
- Error-correcting code
- Error-detecting code
- Error curve
- Error in bearing
- Error signal
- Estuary
- Excavation
- Excavation cover
- Excavator
- Excess attenuation
- Excitation (of an electric machine)
- Excitation winding
- Exclusion Zone
- Executive pulse
- Expand
- Expanded-centre plan display
- Expansion
- Explosive fog signal
- External Procedures
- External combustion engine
- Extra High Pressure Mercury (Vapour) Lamp
- Extreme fibre
- Extruded section
- Eye
- Eye bolt
- Fabric
- Facing wall
- Factor of safety
- Fading
- Fail safe
- Failure
- Failure rate
- Fair-faced concrete
- Falsework
- Fascine
- Fast ice
- Fathom
- Fatigue
- Fatigue limit
- Fault
- Feathering
- Feedback
- Feedback path
- Feedback signal
- Feeder
- Fender
- Fender pile
- Fenders
- Fenders/es
- Ferrite rod antenna
- Ferro-cement
- Fetch
- Field alignment error
- Field coils
- Field pole
- Figure of eight reception
- Filament
- Filament/es
- Filament Support
- Filament Support/es
- Fill factor (FF)
- Filling plug
- Filter
- Final controlled variable
- Final value
- Fishplate
- Fissure
- Fix
- Fixed-pitch blade
- Fixed Lens
- Fixed Light
- Fixed Mark
- Fixed antenna direction finder
- Fixing
- Fixing moment
- Fixity
- Flagpole
- Flame-protected enclosure (or machine)
- Flame Arc Lamp
- Flange (of a girder)
- Flange (of a tube or pipe)
- Flap valves
- Flash
- Flash Tube
- Flashed Glass
- Flasher
- Flasher/es
- Flashing (Optical) Apparatus
- Flashing Light
- Flat top antenna
- Flats
- Flicker Photometer
- Float charge
- Floating Mark
- Floating crane
- Floor (of a room)
- Fluorescence
- Fluorescent Lamp
- Fluorescent Mercury Discharge Lamp
- Focal Distance
- Focal Plane (of a lens or focusing reflector)
- Focal Plane (of a light)
- Focus (of a fixed lens)
- Focusing
- Focusing Device
- Fog
- Fog-bank detector
- Fog Detector Light
- Fog Light
- Fog detector
- Fog signal
- Fog signal/es
- Fog signal/fr
- Fog signal emitter
- Fog signal port
- Fog signal stack
- Folded dipole
- Folded unipole antenna
- Footbridge
- Footing
- Force
- Forced oscillation
- Forelock
- Foreshore
- Formwork
- Forward action (general term)
- Foundation
- Four-stroke engine
- Four-wire repeater
- Frame
- Frame (of an optic)
- Fraunhofer region
- Free oscillation
- Free sound field
- Frequency
- Frequency-modulated radar
- Frequency channel
- Frequency converter
- Frequency deviation
- Frequency division multiplex (FDM)
- Frequency group
- Frequency modulation (FM)
- Frequency monitor
- Frequency swing
- Frequency tolerance
- Fresh concrete