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
See also Low probability of intercept radar (LPIR), a radar system designed to be difficult to detect