LPI may refer to:

Places

• Linköping SAAB Airport, Sweden (IATA code)
• Linus Pauling Institute at Oregon State University
• La Pyramide Inversée, a skylight constructed in an underground shopping mall in front of the Louvre Museum in France
• Lady Parry Island, an uninhabited island in Nunavut, Canada, in the Gulf of Boothia

Organizations

• Lunar and Planetary Institute, a scientific research institute dedicated to study of the solar system, its formation, evolution, and current state
• Linux Professional Institute, a non-profit organization that provides vendor-independent professional certification for Linux system administrators and programmers
• LPI Media, gay and lesbian publisher in the United States

Science and technology

• Liquid penetrant inspection, also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics)
• Lysinuric protein intolerance, an autosomal recessive metabolic disorder affecting amino acid transport
• Liquid propane injection: I've found references, here (enWp). Liquid propane redirects to propane
  • Autogas, ( Autogas#Liquid phase injectors )
  • HSV GTS: The E Series 3 offered the option of HSV LPI (Liquid Propane Injection)
• Autogas#Liquid phase injectors, so both: Liquid phase injectors, Liquid propane injection the same: LPI

Indexes

• Language Proficiency Index, a Canadian standardized test for English proficiency written and administered by the University of British Columbia Applied Research and Evaluation Services
• Limited Price Indexation, a pricing index used in the calculation of increases in certain components of scheme pension payments in the UK
• Living Planet Index, an indicator of the state of global biological diversity, based on trends in vertebrate populations of species from around the world
• Legatum Prosperity Index, an annual ranking developed by the Legatum Institute of 110 countries, according to a variety of factors including wealth, economic growth, personal wellbeing, and quality of life. Norway topped the list of the 2010 report

Other uses

• Licensed Private Investigator, a person who can be hired by individuals or groups to undertake investigatory law services
• Linear partial information, a method of making decisions based on insufficient or fuzzy information
• Lines per inch, a measurement of printing resolution in systems that use a halftone screen. Specifically, it is a measure of how close together the lines in a halftone grid are. Higher LPI indicates greater detail and sharpness
• Low probability of intercept Radar (LPIR), a radar system designed to be difficult to detect
• La Paz Incident, occurred in May 1863 at the ghost town of La Paz in Confederate Arizona and was the westernmost confrontation of the American Civil War

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