GSI

{{for|scientific organizations|#Scientific organizations}}

• Geological Strength Index
• Gonadosomatic Index
• UK Government Secure Intranet
• Grid Security Infrastructure, a computer networking specification
• "Global Systems Integrator", large managed technology services providers
• GS-I (Cellulose synthase (UDP-forming)), an enzyme
• Great Sea Interconnector

• Gemological Science International, gemstone identification/grading/appraisal services
• Geophysical Service Incorporated, an American petroleum exploration corporation
• Guangzhou Shipyard International, a Chinese state-owned shipbuilder
• GSI Commerce, now eBay Enterprise, an American e-commerce company

• GSI Helmholtz Centre for Heavy Ion Research, Germany
• Geographical Society of Ireland
• Geospatial Information Authority of Japan
• Geological Survey of India
• Geological Survey of Ireland

• Global Security Initiative
• Gabinete de Segurança Institucional da presidência da república (Institutional Security Cabinet), Brazil
• Gustav Stresemann Institute, a German educational charity

• Graduate student instructor, a teaching fellow at some US universities
• Grand-Santi Airport, French Guiana (IATA code GSI)

{{Canned search|gsi|gs-i|g-si|g-s-i|gsies|gsis}}

• {{srt}}
• GSL (disambiguation)
• GS-1 (disambiguation), including GS1
• GS (disambiguation)
• GSIS (disambiguation)

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