SPI may refer to:
Businesses Simulations Publications, Inc., a former US board game publisher Sony Pictures Imageworks, a subsidiary of Sony specializing in computer animation Stream Processors, Inc, a semiconductor company
Organizations Indian Protection Service, a former Brazilian agency whose Portuguese name (Brazil's native language) is Serviço de Proteção ao Índio Sisters of Perpetual Indulgence, an LGBT activism movement Society for Philosophical Inquiry, a non-profit organization devoted to propagating a version of Socratic inquiry Society of the Plastics Industry, a U.S. trade association Software in the Public Interest, an American non-profit organization dedicated to the creation and distribution of free open-source software Software Patent Institute, an American non-profit organization assisting in obtaining software patents St. Pascual Institution, a former name of a school in the Philippines (now named Colegio de San Pascual Baylon) St. Paul's Institution, a school in Malaysia Sustainable Preservation Initiative, of cultural heritage Sveriges Pensionärers Intresseparti, or Swedish Senior Citizen Interest Party Social Progress Imperative, a US-based nonprofit created in 2012
Computing SCSI Parallel Interface, a suite of standards for inter-connecting electronic devices Serial Peripheral Interface, the de facto standard for serial communication Security Parameter Index in IPSec tunneling Server Programming Interface, an API for PostgreSQL to run SQL queries from the C programming language Service provider interface, an API for Java Software Process Improvement, an approach to software development initiated by the Data & Analysis Center for Software System Packet Interface, a set of specifications for transferring data in computing applications Stateful Packet Inspection a type of firewall used in network computing
Other uses Schedule Performance Index, a figure of merit used in earned value management Single-point injection, an obsolete method of injecting fuel into an internal combustion engine Social Progress Index of countries Abraham Lincoln Capital Airport (IATA code), US Sediment Profile Imagery, a technique for underwater photography of the interface between the seabed and the overlying water South Padre Island, a resort town in Cameron County, Texas Spi-calculus (Synchronous -calculus), a proposed extension of -calculus Superintendent of Public Instruction, a state-level official in the United States who is responsible for public education (all states have such an official, but some states have a slightly different title for the position) Swiss Performance Index, one of the indecies used to measure the performance of the SIX Swiss Exchange
See also SPI 200 futures contract, Australian index Spy (disambiguation)