| Abbreviation | Definition |
|---|---|
| GR | Growth Ratio |
| GRAIL | Gravity Recovery and Interior Laboratory |
| GRF | Glomerular filtration rate |
| GRFL | Groundwater Remediation Field Laboratory |
| GRL | General Research Laboratory |
| GRL | Geospatial Research Laboratory |
| GS | Growth System |
| GSEL | Guidance System Evaluation Laboratory |
| GSH | Glutathione SH |
| GSK | Gram Stain Kit |
| GSL | Genomic Sciences Laboratory |
| GSL | Glucosinolates |
| GSR | Gross Stimulation Rate |
| GST | p53 Glutathione S-Transferase |
| GSTL | Geomorphology and Sediment Transport Laboratory |
| GTL | Gas Turbine Laboratory |
| GTL | Gene Technologies Laboratory |
| GTL | Genetic Testing Laboratory |
| GTL | Global Testing Laboratories |
| GTN | Glyceryl TriNitrate |