| IGS | 2D or 3D CAD model Initial Graphics Exchange Specification format 
| Others |
| IGS | I Guess So
| Others |
| IGS | IBM Global Services
| Others |
| IGS | Idaho Geological Survey
| Others |
| IGS | Ilkley Grammar School
| Others |
| IGS | Image Guided Systems
| Others |
| IGS | Image Systems Grayscale
| Others |
| IGS | Image-Guided Surgery
| Others |
| IGS | Imerslund-Gräsbeck Syndrome
| Others |
| IGS | Impact Guidance System
| Others |
| IGS | Inappropriate Gonadotropin Secretion
| Others |
| IGS | Independent Gaming Solutions
| Others |
| IGS | Indian Geotechnical Society
| Others |
| IGS | Indian Gospel Singers
| Others |
| IGS | Indian Government Service
| Others |
| IGS | Indiana Geological Survey
| Others |
| IGS | Indoor Grow System
| Others |
| IGS | Industrial Gateway Server
| Others |
| IGS | Inertial Guidance System
| Others |
| IGS | Infinite Game Shows
| Others |
| IGS | Information Gateway Services
| Others |
| IGS | Information Gathering Satellite
| Others |
| IGS | Information Gathering Satellites
| Others |
| IGS | Information Global Service
| Others |
| IGS | Information Governance Solutions
| Others |
| IGS | Information Governance Strategy
| Others |
| IGS | Informational Global Services
| Others |
| IGS | Ingolstadt Manching Airport
| Others |
| IGS | Inner Gulf Shelf
| Others |
| IGS | Ins Giant System
| Others |
| IGS | Insoluble Glue Substances
| Others |
| IGS | Instantaneous Gearchange System
| Others |
| IGS | Institute for Genome Sciences
| Others |
| IGS | Institute for Global Studies
| Others |
| IGS | Institute for Graduate Studies
| Others |
| IGS | Institute for Guided Studies
| Others |
| IGS | Institute of General Semantics
| Others |
| IGS | Institute of Geological Sciences
| Others |
| IGS | Institute of Governmental Studies
| Others |
| IGS | Institute of Graduate Studies
| Others |
| IGS | Instrument Guidance System
| Others |
| IGS | Instrument Guiding System
| Others |
| IGS | Integrated Gaming System
| Others |
| IGS | Integrated Gas System
| Others |
| IGS | Integrated Global Services
| Others |
| IGS | Integrated Group Services
| Others |
| IGS | Intelligence Gathering Satellite
| Others |
| IGS | Intelligent Glass Solutions
| Others |
| IGS | Intelligent Global Solutions
| Others |
| IGS | Intelligent Guide System
| Others |
| IGS | Inter Genic Spacer
| Others |
| IGS | Inter Graphics Systems
| Others |
| IGS | Inter-Generational Snapshot
| Others |
| IGS | Interactive Geometry Software
| Others |
| IGS | Interchange Group Separator
| Others |
| IGS | Intergenic Spacer
| Others |
| IGS | Intermediate General Support
| Others |
| IGS | International and Global Studies
| Others |
| IGS | International Games System
| Others |
| IGS | International Gem Society
| Others |
| IGS | International Genetic Standardization
| Others |
| IGS | International Gentlemans Society
| Others |
| IGS | International Geoscience Services
| Others |
| IGS | International Geosynthetic Society
| Others |
| IGS | International Geosynthetics Society
| Others |
| IGS | International Glaciological Society
| Others |
| IGS | International Glass Solutions
| Others |
| IGS | International Global Studies
| Others |
| IGS | International GNSS (Global Navigation Satellite System) Service
| Others |
| IGS | International GNSS Service
| Others |
| IGS | International Gps Service
| Others |
| IGS | International Graduates Scheme
| Others |
| IGS | International Grammar School
| Others |
| IGS | International Grantmaking Symposium
| Others |
| IGS | International Green Structures
| Others |
| IGS | International Guest Scholarships
| Others |
| IGS | International Guitar Seminars
| Others |
| IGS | Internet Go Server
| Others |
| IGS | Investor Group Services
| Others |
| IGS | Iowa Geological Survey
| Others |
| IGS | Ipswich Grammar School
| Others |
| IGS | Iranian Gas Standards
| Others |
| IGS | Irish Georgian Society
| Others |
| IGS | Irritable Gripe Syndrome
| Others |
| IGS | Island Guardian Series
| Others |
| IGS | Islington Green School
| Others |
| IGS | Israel Geological Society
| Others |
| IGS | Ivanhoe Grammar School
| Others |