'''SPI''' may mean: *SCSI Parallel Interface *Secure._Protect._Inspect. S.P.I. Dynamics, Inc. http://www.spidynamics.com *Security_Parameter_Index (networking) *Serial_Peripheral_Interface (electronics) *Service_Provider_Interface *Simulations_Publications Inc., a board game company *Singapore_Paranormal_Investigators *Single Page Interface (see Single_Page_Application) *Sisters_of_Perpetual_Indulgence, international non-profit organization raising money for AIDS projects and other community service organizations, and espousing Safer_sex and personal responsibility (www.thesisters.org) *Society_of_the_Plastics_Industry, a trade association for the plastics industry (www.socplas.org) *Software_in_the_Public_Interest *Software_Patent_Institute, non-profit organization providing Prior_art in the field of software technology *Stateful_Packet_Inspection (computer networking) *''Sveriges_Pensionärers_Intresseparti'', political party in Sweden (SPI-Partiet) *Swiss_Performance_Index *System_Packet_Interface, a family of interfaces from the Optical_Internetworking_Forum {{TLAdisambig}}