LPI

LPI may refer to:

Places

 * Linköping/Saab Airport (IATA code), Sweden
 * Linus Pauling Institute, at Oregon State University, US
 * 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

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, a gay and lesbian publisher in the United States

Science and technology

 * Dye penetrant inspection or liquid penetrant inspection, an inspection method used to locate surface-breaking defects in all non-porous materials
 * Lysinuric protein intolerance, an autosomal recessive metabolic disorder affecting amino acid transport
 * Leaf plastochron index, a measure of plant leaf age based on morphological development
 * Lysophosphatidylinositol, an endocannabinoid neurotransmitter
 * Living Planet Index, an indicator of the state of global biological diversity, based on trends in vertebrate populations of species from around the world
 * Lines per inch, a measurement of printing resolution
 * Laser Peripheral Iridotomy; See Glaucoma surgery
 * Liquid phase injectors and liquid propane injection, in autogas
 * Low-power idle in Energy-Efficient Ethernet

Economics and finance

 * Logistics Performance Index, a benchmarking tool created by the World Bank
 * Limited Price Indexation, a pricing index used in the calculation of increases in certain components of scheme pension payments in the UK
 * Legatum Prosperity Index, an annual ranking developed by the Legatum Institute

Other uses

 * 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
 * Language Proficiency Index, a Canadian standardized test for English proficiency written and administered by the University of British Columbia Applied Research and Evaluation Services
 * Leading pedestrian interval, a type of traffic control
 * Licensed private investigator, a type of private investigator
 * Liga Primer Indonesia, an Indonesian top-tier football league held in 2011
 * Linear partial information, a method of making decisions based on insufficient or fuzzy information