GIS (disambiguation)
- Advanced Satellite for Cosmology and Astrophysics
- Cemetery GIS
- Determinative
- GI (disambiguation)
- Garden International School
- Gateshead International Stadium
- General Intelligence Directorate (Egypt)
- General Intelligence Service (Sudan)
- General Mills
- Generalized iterative scaling
- Georgian Intelligence Service
- German International School Doha
- Ghana Immigration Service
- Gippsland Independent Schools
- Girlguiding
- Gis Gelati
- Gis, Iran
- Gisborne Airport
- Giš
- Global Indian School
- Global information system
- Goshen Intermediate School
- Grace International School
- Granada Islamic School
- Green investment scheme
- Greenland ice sheet
- Greenoak International School
- Grey Island Systems International
- Gruppo di intervento speciale
- Guaranteed Income Supplement
- Guide International Service
- Gunawan Iron and Steel
- G♯ (musical note)
- Information Services Department
- Integrated Security Unit
- Jizz (disambiguation)
- Koori Radio
- Madhya Pradesh Global Investors' Summit
- North Giziga language
- Partenope Napoli Basket
- Special Intervention Group
- Switchgear