EFX may refer to:

  • EFX (show), a Las Vegas show
  • EFX (album), an album of the show
  • Enerflex Systems, a Canadian company listed as EFX on the Toronto Stock Exchange
  • Equifax, a U.S. consumer credit reporting agency listed as EFX on the New York Stock Exchange
  • Effects Extension (EFX), a set of digital signal processing extensions for the OpenAL audio API
  • .efx, the Everett Efax file format, see List of file formats
  • EFX item allocation - a rule for fair allocation of indivisible objects among people with different preferences.

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