- fuzzy space
- fuzzy statistics
- fuzzy structured set
- fuzzy subgroup
- fuzzy subset
- fuzzy system
- fuzzy topology
- fuzzy tree
- fuzzy variable
- f-vector
- FWHM (= full width at half maximum)
- Féjer, L.
- Fёdorov, E.S.(Фёдоров, Е.С.)
- G-action
- gadget
- Gagliardo, E.
- Gagliardo lemma
- gain
- gain control
- gain factor
- gain-floor
- gain function
- gain graph
- Galambos, J.
- Gale, D.