| GI&S | Geospatial Information and Services 
| Others |
| GIS | Bitmap graphics (Erdas gray-scale image)
| Others |
| GIS | Galilee International School
| Others |
| GIS | Garden International School
| Others |
| GIS | Gas Insulated Substation
| Others |
| GIS | Gas Insulated Substations
| Others |
| GIS | Gas Insulated Switchgear
| Others |
| GIS | Gegraphical Image System
| Others |
| GIS | General Information Services
| Others |
| GIS | General Information System
| Others |
| GIS | General Investigative Section
| Others |
| GIS | Generalized Information System
| Others |
| GIS | Generalized Iterative Scaling
| Others |
| GIS | Generic Inventory System
| Others |
| GIS | Gentran Integration Suite
| Others |
| GIS | Geographic Information Science
| Science, Survey, Technology, Satellite Technology, Territory |
| GIS | Geographic Information Service
| Survey, Technology, Satellite Technology, Territory |
| GIS | Geographic Information System
| Survey, Technology, Satellite Technology, Territory |
| GIS | Geography In Space
| Others |
| GIS | Geoinformatic Information Systems
| Others |
| GIS | Geoscience Information Society
| Others |
| GIS | Geospatial Information System
| Others |
| GIS | Get It Surveyed
| Others |
| GIS | Gippsland Independent Schools
| Others |
| GIS | Gis Is Sometimes
| Others |
| GIS | Gisborne Airport
| Others |
| GIS | Gisborne, New Zealand
| Others |
| GIS | Giulia Spider
| Others |
| GIS | Global Imaging System
| Others |
| GIS | Global Information Services
| Others |
| GIS | Global Information Standard
| Others |
| GIS | Global Information System
| Others |
| GIS | Global Information Systems
| Others |
| GIS | Global Inkjet Systems
| Others |
| GIS | Global Input Surge
| Others |
| GIS | Global International Standard
| Others |
| GIS | Global Item Schema
| Others |
| GIS | Golden Isle Speedway
| Others |
| GIS | Google Image Search
| Others |
| GIS | Google Insights for Search
| Others |
| GIS | Government Information System
| Others |
| GIS | Graphic Information System
| Others |
| GIS | Graphical Information System
| Others |
| GIS | Green Investment Scheme
| Others |
| GIS | Gruppo di Intervento Speciale
| Others |
| GIS | Guaranteed Income Supplement
| Others |
| GIS | Guaranteed Interview Scheme
| Others |
| GIS | Guidance and Information System
| Others |
| GIS | Institute of Navigation
| Others |