- Fitness
- Fitness approximation
- Fitness function
- Fitness landscape
- Fitness proportionate selection
- Fittings
- Fitts's law
- Five Whys
- Five-dimensional
- Five-dimensional space
- Five-number summary
- Five-point stencil
- Five-star
- Five-star hotel
- Five-year survival rate
- Fixation
- Fixed capital
- Fixed costs
- Fixed dose procedure
- Fixed effects
- Fixed effects model
- Fixed platforms
- Fixed point
- Fixed position
- Fixed wireless
- Fixed-dose procedure
- Fixed-function
- Fixed-pattern noise
- Fixed-point
- Fixed-point arithmetic
- Fixed-point iteration
- Fixed-point property
- Fixed-wing aircraft
- Fixtures
- Fjords
- Flaccid paralysis
- Flag-tag
- Flagella
- Flagellates
- Flagellin
- Flags
- Flail chest
- Flakes
- Flame
- Flame arrester
- Flame detector
- Flame holder
- Flame lift off
- Flame lift-off
- Flame photometry
- Flame polishing
- Flame retardants
- Flame speed
- Flame spread
- Flame tests
- Flame treatment
- Flammability limit
- Flammable
- Flammable liquid
- Flange
- Flange nut
- Flanging
- Flannel
- Flaperons
- Flaps
- Flaring
- Flash
- Flash animation
- Flash evaporation
- Flash file systems
- Flash fire
- Flash floods
- Flash memory
- Flash photolysis
- Flash point
- Flash smelting
- Flash-gas
- Flashbacks
- Flashing
- Flashover
- Flask
- Flat
- Flat bones
- Flat design
- Flat feet
- Flat file
- Flat map
- Flat module
- Flat organization
- Flat panel detectors
- Flat panel display
- Flat rate
- Flat roofs
- Flat topology
- Flat-file database
- Flat-panel detectors
- Flat-panel displays
- Flatness
- Flattening
- Flattening the curve
- Flatulence
- Flavan-3-ol
- Flavanone
- Flavin
- Flavin mononucleotide
- Flaviviridae
- Flavivirus
- Flavobacteria
- Flavobacteriia
- Flavodoxin
- Flavonoid biosynthesis
- Flavonoids
- Flavoproteins
- Flecainide
- Fleet
- Fleet management software
- Fleet management system
- Fleiss' Kappa
- Flettner rotor
- Flex sensor
- FlexRay
- Flexe
- Flexibility
- Flexibility method
- Flexible battery
- Flexible displays
- Flexible electronics
- Flexible intermediate bulk container
- Flexible manufacturing system
- Flexible organic light-emitting diode
- Flexible-fuel vehicle
- Flexicoil
- Flexion
- Flexoelectricity
- Flexor carpi ulnaris
- Flexor digitorum brevis
- Flexor digitorum longus
- Flexor digitorum profundus
- Flexor digitorum superficialis
- Flexor digitorum superficialis muscle
- Flexor hallucis brevis
- Flexor hallucis longus
- Flexor pollicis brevis
- Flexor pollicis longus
- Flexor retinaculum
- Flexural modulus
- Flexural rigidity
- Flexural strength
- Flexure
- Flibe