SOI
SOI stands for:
- Swiss computer science Olympiad (Swiss Olympiad in Informatics), programming contest for young people under 20 years
 - Silicon on Insulator , manufacturing process of semiconductor components
 - Southern Oscillation Index , a measure used to predict and estimate the El Niño phenomenon
 - Sphere of Influence , planet-specific, computational quantity in astrodynamics
 - Structure of Intellect , model of intelligence research
 - Southeast Institute , research facility for the past and present of the countries of Southeast Europe
 - Swiss East Institute , former documentation center on communist countries in Switzerland
 
Soi stands for:
- Soi , a back street in the Thai language
 
People:
- Edwin Cheruiyot Soi (* 1986), Kenyan long-distance runner
 - Pascal Chang-Soi (* 1966), French priest, coadjutor bishop of Taiohae o Tefenuaenata
 
soi stands for:
- Sonha (ISO-639-3 code), one of the varieties of the Tharu languages , a language group of the Eastern Indo-Aryan languages