| G (+ number) | Green or Golf (airway designator) |
| G | Grid (Track) |
| G | Guards only (radio frequencies) |
| GA | General Aviation |
| G/A | Ground-to-Air |
| G/A/G | Ground-to-Air and Air-to-Ground |
| GAL | Gallons |
| GC | Great Circle |
| GCA | Ground Controlled Approach |
| GCO | Ground Communication Outlet |
| GEN | General |
| GEO | Geographic or True |
| GLONASS | Global Orbiting Navigation Satellite System |
| GMC | Ground Movement Control |
| GMT | Greenwich Mean Time |
| GNC | Global Navigation and Planning Chart |
| GND | Ground |
| GND | Ground Control |
| GNDCK | Ground check |
| GNSS | Global Navigation Satellite System |
| GP | Glide Path (ILS) |
| GPS | Global Positioning System |
| GRADU | Gradual; Gradually |
| GS | Ground Speed |
| GS | Ground Services |
| G/S | Ground Speed |
| GS | Glide Slope |
| GS out | Glide Slope U/S |
| GT | Grid Track |
| GWT | Gross Weight |
