- Functional programming
- Functional requirements
- Functional residual capacity
- Functional specification
- Functional spinal unit
- Functional testing
- Functional verification
- Functionality
- Functionally complete
- Functionally graded materials
- Functor
- Fundamental analysis
- Fundamental constants
- Fundamental diagram
- Fundamental frequency
- Fundamental group
- Fundamental lemma of calculus of variations
- Fundamental matrix
- Fundamental solution
- Fundamental theorem of algebra
- Fundamental theorem of arithmetic
- Fundamental theorem of calculus
- Fundamental theorem of linear programming
- Fundamental units
- Fundus
- Fundus photography
- Fungal
- Fungal infections
- Fungi
- Funnel plot
- Fura-2
- Fura-2-acetoxymethyl ester
- Furan
- Furan resin
- Furanocoumarin
- Furanone
- Furanose
- Furfural
- Furfuryl alcohol
- Furin
- Furnace
- Furniture
- Furring
- Furuta Pendulum
- Fusarium oxysporum
- Fuse plugs
- Fused quartz
- Fusel oil
- Fuselage
- Fusible alloy
- Fusiform
- Fusiform gyrus
- Fusion
- Fusion power
- Fusion proteins
- Fusion reactor
- Fusion splicing
- Fusion welding
- Fusobacterium nucleatum
- Futures studies
- Fuzes
- Fuzzy associative matrix
- Fuzzy classification
- Fuzzy clustering
- Fuzzy cognitive map
- Fuzzy concept
- Fuzzy control
- Fuzzy control system
- Fuzzy extractor
- Fuzzy hashing
- Fuzzy logic
- Fuzzy mathematics
- Fuzzy numbers
- Fuzzy rule
- Fuzzy set operations
- Fuzzy sets
- G band
- G protein-coupled receptors
- G-10
- G-code
- G-loc
- G-modules
- G-quadruplexes
- G-suits
- G418
- G6PD
- GABA
- GABA receptors
- GABA transaminase
- GABAergic
- GAGAN
- GALS
- GAMS
- GAN
- GAP
- GAPDH
- GARCH
- GATA2
- GB
- GC box