| IGRS | Illiana Garden Railway Society 
| Others |
| IGRS | Imidazoline Guanidinium Receptive Sites
| Others |
| IGRS | Indonesian Game Rating System
| Others |
| IGRS | Information Gathering and Retrieval System
| Others |
| IGRS | Inspector General of Registration and Stamps
| Others |
| IGRS | Institute of Geoinformatics & Remote Sensing
| Others |
| IGRS | Institute of Geoinformatics Remote Sensing
| Others |
| IGRS | Institute of Germanic and Romance Studies
| Others |
| IGRS | Institute of Germanic Romance Studies
| Others |
| IGRS | Integrated Gas Recovery Services
| Others |
| IGRS | Integrated Geodetic Reference Stations
| Others |
| IGRS | Integrated GPS Radio System
| Others |
| IGRS | Integrated Grievance Redressal System
| Others |
| IGRS | Intelligence Gathering and Retrieval System
| Others |
| IGRS | Intelligent Grouping and Resource Sharing
| Others |
| IGRS | Investor Grievance Redressal System
| Others |
| IGRS | Iraqi Geospatial Reference System
| Others |
| IGRS | Irish Genealogical Research Society
| Others |