NPI

NPI may refer to:

Institutes

 * Non-profit institution
 * Nationaal Pop Instituut: the Dutch Rock & Pop Institute
 * National Policy Institute, an American white supremacist think tank
 * New Policy Institute, a British think tank focusing on poverty
 * Nordic Patent Institute, a patent search organisation for Nordic countries
 * Northwest Progressive Institute, a liberal American think tank concerned with social policy
 * Norwegian Polar Institute, performs environmental research in the polar regions

Other uses

 * Narcissistic Personality Inventory, a standard personality test for evaluating self-centredness
 * National pollutant inventory
 * National Provider Identifier
 * Negative polarity item, grammatical form used during negation
 * New Politics Initiative
 * New product introduction
 * Nickel pig iron
 * Non-pharmaceutical intervention, health measures that are not centred on drug treatments
 * Non-pharmaceutical intervention (epidemiology), measures such as social distancing, face masks etc. to prevent COVID-19 etc.
 * Nonpublic personal information (Gramm–Leach–Bliley Act)
 * No pun intended
 * Nottingham Prognostic Index
 * NP-intermediate, a complexity class in computational complexity theory
 * Numbering plan indicator