| Acronym | Definition |
|---|
| IGS | Institute of Governmental Studies |
| IGS | IBM Global Services (IBM consulting organization) |
| IGS | Internet Go Server |
| IGS | International Glaciological Society |
| IGS | Image-Guided Surgery |
| IGS | Institute for Global Studies |
| IGS | Inert Gas System (tankers) |
| IGS | International Geosynthetics Society |
| IGS | Institute of Geological Sciences |
| IGS | Ipswich Grammar School (Australia) |
| IGS | Information Gathering Satellite (Japan) |
| IGS | Institute of General Semantics |
| IGS | Inertial Guidance System |
| IGS | Innovative Gas Systems |
| IGS | International Ground Station |
| IGS | Israel Geological Society |
| IGS | Inspection Général des Services (French police) |
| IGS | Identify Graphic Subrepertoire (ITU-T) |
| IGS | Imerslund-Grasbeck Syndrome |
| IGS | Improved Gray Scale |
| IGS | Integrated Gaming System |
| IGS | Integrated Graphics System |
| IGS | International Genealogical Search |
| IGS | Integrated Gateway Server (Cisco) |
| IGS | Internet Gaming System |
| IGS | Indiana Gourd Society |
| IGS | Information Generation System |
| IGS | Internal German Service (Pan Am's domestic network in West Germany 1950-1990) |
| IGS | International Geranium Society |
| IGS | Intermediate General Support |
| IGS | Intermountain Generating Station (Delta, UT) |
| IGS | IGES (Initial Graphics Exchange Specification) Format (file extension) |
| IGS | Idaho Gourd Society |
| IGS | Integrated Geo Systems (computational architecture) |
| IGS | Imagery & Geospatial Support (NIMA) |
| IGS | Inner Glide Slope |
| IGS | Improved Guidance System |
| IGS | International GNSS (Global Navigation Satellite Systems) Service (formerly International GPS Service) |
| IGS | Interactive Graphics Subsystem |
| IGS | Inacom Government Systems, Inc. |
| IGS | Institutional Grants Scheme (Australia) |
| IGS | Informatics Graduate School (UK) |
| IGS | Institute of the Good Shepherd (est. 2006) |