Other
- Bone fracture, in medical short-hand
- Factor X, a protein involved in coagulation
- FedEx Express, IATA airline designator
- Foreign exchange market, a banking term for changing money from one currency into another
- The forward exchange rate, in economics shorthand
- Foreign exchange service (telecommunications), a telephone connection to a distant exchange
- Francis Xavier (1506–1552), Basque saint and co-founder of the Jesuits
- Fuji Xerox, Japanese document company
- FX (trade magazine), a UK trade magazine
- FX (Fighter Experimental), two specifications for two US Naval fighter projects
- an abbreviation for the French given name François-Xavier
- The unofficial designation of the Holden 48-215, the first automobile by Australian company Holden
- fX Sudirman, mall in South Jakarta
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