NPI

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