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- Flysch
- Flywheel energy storage
- Flywheels
- Fmoc
- Foam
- Foam cell
- Foam concrete
- Foam fractionation
- Foam glass
- Foam rubber
- Foamcore
- Foaming agents
- Focal adhesions
- Focal depth
- Focal length
- Focal plane
- Focal plane array
- Focal surface
- Focal-plane array
- Fock states
- Focus
- Focus groups
- Focus stacking
- Focus variation
- Focused crawler
- Focused ultrasound
- Fog
- Fog collection
- Fog computing
- Foil
- Foil bearings
- Folate
- Folate deficiency
- Folate receptor
- Fold
- Fold and thrust belt
- Foldamers
- Folded normal distribution
- Folding
- Folding wings
- Foley catheter
- Folfirinox
- Folic acid
- Folin-Ciocalteu reagent
- Folk theorem
- Follicle
- Follicular cells
- Follicular lymphoma
- Follicular phase
- Folliculitis
- Folliculogenesis
- Fomite
- Fontanelles
- Food
- Food allergies
- Food allergy
- Food biodiversity
- Food chemistry
- Food coating
- Food coloring
- Food distribution
- Food drying
- Food energy
- Food engineering
- Food fortification
- Food industry
- Food irradiation
- Food loss and waste
- Food miles
- Food processing
- Food rheology
- Food vacuoles
- Food waste
- Foot
- Foot odor
- Foot pressure
- Foot-and-mouth disease
- Foot-and-mouth disease virus
- Foot-candle
- Footbridges
- Foothills
- Footpaths
- Footprints
- For loop
- Foramen magnum
- Foramen ovale
- Forbidden
- Force
- Force carrier
- Force control
- Force density
- Force feedback
- Force fields
- Force gauge
- Force of mortality
- Force platform
- Force-directed graph drawing
- Force-field analysis
- Force-sensing resistor
- Forced Rayleigh scattering
- Forced circulation boilers
- Forced convection
- Forced draught
- Forced induction
- Forced-air
- Forced-circulation boiler
- Forceps
- Forces
- Ford viscosity cup
- Fordism
- Fords
- Forearc
- Forearm
- Forebrain
- Forecast error
- Forecast period
- Forecasting
- Foredunes
- Foregut
- Forehead
- Foreign body
- Foreign body reactions
- Foreign keys
- Foreign-body giant cells
- Foreland basins
- Forensic
- Forensic engineering
- Forensic pathology
- Forensic science
- Foreset beds
- Foresets
- Foreshocks
- Forest cover
- Forest degradation
- Forest floor
- Forest inventory
- Forest management
- Forest plots
- Forest restoration
- Forge welding
- Forgetful functor
- Forging
- Forging temperature
- Fork
- Forklifts
- Form factor
- Formability
- Formal
- Formal charge
- Formal concept analysis