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NPI may refer to:

  • Non-Profit Institutions in the System of National Accounts, 1993 (1993 SNA)
  • Numbering plan indicator
  • Negative polarity item, a lexical element limiting scope of linguistic constructions
  • New Politics Initiative
  • New Policy Institute
  • New product introduction
  • National Policy Institute
  • National Provider Identifier
  • Nickel pig iron
  • No pun intended
  • Nonpublic Personal Information ( Gramm–Leach–Bliley Act)
  • Northwest Progressive Institute
  • Norwegian Polar Institute
  • Nottingham Prognostic Index
  • Nationaal Pop Instituut: the Dutch Rock & Pop Institute
  • National pollutant inventory
  • Narcissistic Personality Inventory, a standard personality test for evaluating self-centredness
  • Nordic Patent Institute
  • NP-intermediate, a complexity class in computational complexity theory