SWI

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

• 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

• 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

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