SPI
SPI may refer to:
| Look up spi in Wiktionary, the free dictionary. | 
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
 - Service provider interface, an API
 - Software Process Improvement, of Data & Analysis Center for Software
 - System Packet Interface for networking
 - Stateful Packet Inspection for networking
 
Other uses
    
- Single-point injection
 - Social Progress Index of countries
 - Abraham Lincoln Capital Airport (IATA code), US
 - Sediment Profile Imagery underwater
 - Spi-calculus, a proposed extension of Π-calculus
 - Swiss Performance Index, a stock index
 
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