Institutes
- Scottish Trade International (1991-2001), see replacement agency Scottish Development International
- Sega Technical Institute, video game development division of Sega
- Semantic Technology Institute International, a scientific and research network; also some of its members call themselves STI
- Southern Technical Institute, university in Marietta, Georgia, USA
- STI Colleges, the Philippines largest college in IT-based education courses
- Swiss Tropical Institute, health institute
- Systems Technology Institute, profit information technology-based colleges in the Philippines
- Subaru Tecnica International, motorsports division
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