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XSI may refer to:

  • Softimage XSI, a high-end three-dimensional (3D) graphics application
  • South Indian Lake Airport, the IATA code for the airport in Canada
  • Canon EOS 450D, known as EOS Rebel XSi in North America, a DSLR camera from Canon
  • X/Open System Interfaces Extension, a supplementary specification to the Single UNIX Specification
  • A conventional XML namespace prefix for XML Schema instance information
  • Broadsoft Xtended Services Interface, a set of APIs for integrating BroadWorks functions with Internet services
  • XS_International is an IT firm that provides networking solutions.