| GPRS | General Packet Radio Service |
| GSM | Global System for Mobile communication |
| GATE | Graduate Aptitude Test in Engineering |
| GPA | Grade Point Average |
| GIF | Graphics Interchange Format |
| GNU | GNU's Not UNIX |
| GPS | Global Positioning System |
| GDP | Gross Domestic Product |
| GST | Goods and Service Tax |
| GFR | Glomerular Filtration Rate |
| GTT | Glucose Tolerance Test |
| GMO | Genetically Modified Organism |
| GOOGLE | Global Organization of Oriented Group Language of Earth |
| GAIL | Gas Authority of India Limited |
| GTG | Got To Go |
| GNM | General Nursing and Midwifery |
| Gr8 | Great |
| GSET | Gujarat State Eligibility Test |
| GALT Time Zone | Galapagos Time (Standard Time) |
| GAMT Time Zone | Gambier Time (Standard Time) |
| GET Time Zone | Georgia Standard Time (Standard Time) |
| GILT Time Zone | Gilbert Island Time (Standard Time) |
| GMT Time Zone | Greenwich Mean Time / Coordinated Universal Time (Standard Time) |
| GST Time Zone | Gulf Standard Time (Standard Time) |
| GYT Time Zone | Guyana Time (Standard Time) |
