SWI

SWI may refer to:

Places

 * Switzerland (this is not the ISO 3166-1 code, which is CHE)
 * Swindon railway station (National Rail code SWI), serving Swindon, Wiltshire, United Kingdom

Science and technology

 * SWI-Prolog, a free implementation of the programming language Prolog
 * Susceptibility weighted imaging, in magnetic resonance imaging (MRI) used in medical contexts
 * Software interrupt, an interrupt routine in a computer operating system
 * SWI, an assembler mnemonic to perform a software interrupt on the ARM microprocessor family
 * Szilagyi Waterspout Index

Other uses

 * Swissinfo, a service of the Swiss Broadcasting Corporation
 * Switzerland, UNDP country code
 * Structured Word Inquiry, a pedagogical technique involving the scientific investigation of the spelling of words
 * Scottish Women's Institutes, a registered charity in Scotland