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SIV or Siv may refer to:

  • Simian immunodeficiency virus, a virus found in primates and related to HIV
  • SIV, the IATA and FAA airport code for Sullivan County Airport, Sullivan County, Indiana, USA
  • Simulation d’incidents en vol, or simulation of flying incidents training
  • Sydney Intervarsity Choral Festival
  • Sheffield International Venues, a facilities management company in Sheffield, UK
  • Stress-induced voiding, a failure mechanism in MOSFETs
  • Structured investment vehicle, a type of fund in the non-bank financial system
  • Swine influenza virus, the cause of influenza in pigs
  • Synthetic Initialization Vector, a cryptographic key-wrapping algorithm
  • Federal Executive council or Savezno izvršno veće (SIV) in Yugoslavia
  • Siv, Iran, a village in Kurdistan Province, Iran
  • S IV, a shortcut pronoun for the Samsung Galaxy S4 Android smartphone
  • Surinaamse Islamitische Vereniging