X3 or x3 stands for:

  • InterNational Committee for Information Technology Standards, a standardization organization in the information technology, also known as the founding name Accredited Standards Committee X3, Information Technology
  • The computer game X ³: Reunion or its successor X ³: Terran Conflict and its add-on, X ³: Albion Prelude from the series X (computer game)
  • Foveon X3, an image sensor in digital photography
  • BMW X3, a sport utility vehicle
  • Airline TUIfly or the underlying company Hapag -Lloyd Express, as its IATA code
  • A class of interference suppression capacitors
  • A cat's face as an emoticon
  • The version 13.0 of Corel Draw Graphics Suite
  • AMD Phenom X3, a microprocessor
  • Extra 3, a satirical program
  • Eurocopter X3, a high-speed helicopter
  • Alstom Coradia X3, a Swedish airport train
  • Disambiguation
  • Abbreviation