| Acronym | Definition |
|---|
| IGRS | Institute of Germanic and Romance Studies (UK) |
| IGRS | Intelligent Grouping and Resource Sharing |
| IGRS | image-guided radiosurgery |
| IGRS | IPEDS (Integrated Postsecondary Education Data System) Graduation Rate Survey |
| IGRS | Irish Genealogical Research Society (UK) |
| IGRS | Iraqi Geospatial Reference System |
| IGRS | Integrated Gas Recovery Services Inc. (Thorold ON, Canada) |
| IGRS | Integrated GPS Radio System (developed by Stanford Research Institute) |
| IGRS | Illiana Garden Railway Society |
| IGRS | Information Gateway Resource Sharing |
| IGRS | Information Group Resource System |
| IGRS | Information Gathering and Retrieval System (US IRS) |
| IGRS | IronWood Guide to Railway Safety |
| IGRS | imidazoline-guanidinium receptive site (membrane-bound protein) |
| IGRS | Infant Gastric Reflux Stories (New Zealand) |
| IGRS | Intelligence and Geographic Resources Staff (UK MoD) |
| IGRS | Irish Graves Registration Society |
| IGRS | Intergovernmental Review System |
| IGRS | Iron Gate Reservoir Surface |