SPI

SPI may refer to:

Organizations

 * Indian Protection Service (Serviço de Proteção ao Índio), Brazil
 * Shotmed Paper Industries, an Egyptian paper manufacturers
 * Simulations Publications, Inc., a former US board game publisher
 * Sony Pictures Imageworks
 * Stream Processors, Inc, a semiconductor company
 * Sisters of Perpetual Indulgence, an LGBT group
 * Society for Philosophical Inquiry
 * Society of the Plastics Industry, a U.S. trade association
 * Software in the Public Interest
 * Software Patent Institute, US
 * St. Pascual Institution, Philippines school
 * 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
 * Serial Peripheral Interface
 * Security Parameter Index in IPSec tunneling
 * Server Programming Interface, an API for PostgreSQL to run SQL queries from C
 * Service provider interface, an API for Java
 * Software Process Improvement, of Data & Analysis Center for Software
 * System Packet Interface for networking
 * Stateful Packet Inspection for networking

Other uses

 * Schedule Performance Indicator, a performance indicator within project management
 * Single-point injection
 * Social Progress Index of countries
 * Abraham Lincoln Capital Airport (IATA code), US
 * Sediment Profile Imagery underwater
 * South Padre Island, a resort town in Cameron County, Texas
 * Spi-calculus, a proposed extension of Π-calculus
 * Swiss Performance Index, a stock index