| Abbreviation | Definition |
|---|---|
| GIBA | Gasparilla Island Bridge Authority |
| GICA | Gulf Intracoastal Canal Association |
| GICW | Gulf Inter-Coastal Waterway |
| GIG | Gear Is Good |
| GIGO | Garbage In, Garbage Out |
| GIR | Goods Inspection Report |
| GIS | Geographical Information Systems |
| GL | Gasoline Leech |
| GL | Gear Lube |
| GL | Gear Lubricant |
| GL | Generation Language |
| GL | Grand Line |
| GL | Grand Luxe |
| GL | Grand Luxury |
| GL | Green Light |
| GLAP | Gate Line Assistance Point |
| GLC | Great Little Car |
| GLH | Go Like Hell |
| GLO | Gloucester, England |
| GLONASS | Global Orbiting Navigational Satellite System |