Arx, ARX, or ArX may refer to:

  • ARX (Algorithmic Research Ltd.), a digital security company
  • ARX (gene), Aristaless related homeobox
  • ARX (operating system), an operating system
  • Arx (Roman), a Roman citadel, and in particular:
  • The northern hump of the two forming the Capitoline Hill of ancient Rome
  • Arx, Landes, a commune of the Landes département in France
  • Arx Fatalis, a first person role-playing game developed by Arkane Studios in 2002
  • Arx, a sculpture by Lars Vilks
  • Americas Rallycross Championship, also known as ARX Rallycross
  • Add-Rotate-XOR; see block cipher
  • (1922-1988), mycologist from the Netherlands

See also

  • Beretta ARX160, an assault rifle
  • ObjectARX, a software API for AutoCAD
  • ARCS (disambiguation)
  • Arcs (disambiguation)
  • ARC (disambiguation)
  • Arc (disambiguation)
  • Ark (disambiguation)
  • Arq (disambiguation)