| Acronym | Definition |
|---|
| F | Full |
| F | Fax |
| F | Female |
| F | Failure |
| F | False |
| F | Fail |
| F | Fighter (US military aircraft designation; as in F-16) |
| F | Fahrenheit |
| F | If |
| F | Found |
| F | First (class airfare) |
| F | Fast (logic integrated circuits) |
| F | Front |
| F | Field |
| F | Fine |
| F | Ford Motor Company (stock symbol) |
| F | Friend(s) |
| F | Force |
| F | Flash (Precedence Level) |
| F | France (International Auto Identification) |
| F | Registration (Scott Catalogue prefix; philately) |
| F | Forward |
| F | Fine (numismatics; 10th best condition of coin) |
| F | Fine (book condition) |
| F | Function |
| F | Frankfurt (German auto license plates) |
| F | Fixed |
| F | Filter |
| F | Flag |
| F | Fellow |
| F | Flat (welding position) |
| F | Fog (weather teports) |
| F | Frequency |
| F | Fuse |
| F | Fault |
| F | Forte (music) |
| F | Focal length (photography) |
| F | Failing Grade |
| F | Fraction |
| F | Float (C programming language) |
| F | Foul (baseball) |
| F | Fable (video game) |
| F | Felony |
| F | Folio |
| F | Francs |
| F | Fiduciary (IRB) |
| F | Flight Inspection |
| F | Fujita (tornado intensity scale, ranging from F1 to F5) |
| F | Foxtrot |
| F | Fluorine |
| F | Fleer (baseball card manufacturer) |
| F | Phenylalanine (amino acid) |
| F | Bioavailability (fraction of drug reaching systemic circulation) |
| F | Farad |
| F | Fuze |
| F | Flunked |
| F | Flunk |
| F | Fishing Mortality (fisheries population dynamics) |
| F | Femto- (10^-15, SI Prefix) |
| F | Functor (abstract algebra) |
| F | Froude Number |
| F | Faraday Constant |
| F | Functional Distribution |
| F | Filial Generation (genetics) |
| F | Flare Patterns (US DoD) |
| F | Fairchild Aircraft Limited (manufacturer's symbol; Canada) |
| F | Fsmart (China) |
| F | Frequency of Lifting |
| F | Federal Reserve Bank of Atlanta, Georgia (designates original point of circulation of a dollar bill) |
| F | Fisher's F Ratio (statistics; usually written in italics) |
| F | F Sub-Shell (fourth outer subshell of an electron shell) |
| F | Cleared to Fix |
| F | Undenominated United States Stamp (29 cents, introduced 3 Feb 1991) |
| F | At City Shop for Repairs (Alabama Public Safety Radio Code) |