| Acronym | Meaning |
 | FY | Fiscal Year |
| G | Giga (Billion) |
| G | Gravity |
| G | Units Of Gravitational Force |
| G | IWG Ground Interface Working Group |
| G | LOW Gross Lift-Off Weight |
| G | LOW Ground Lift-Off Weight |
| G | CCC Ground Control Computer Center |
| G | F&PGases |
| G&A | General And Administrative |
| G&C | Guidance And Control |
| G&N | Guidance And Navigation |
| G&NGUIDANC | And Navigation |
| G&NS | Guidance And Navigation Subsystem |
| G-11 | Gulfstream 11 (Shuttle Training Aircraft) |
| G-A | Ground-to-Air |
| G-G | Ground-to-Ground |
| G-MEM | General Memory |
| G-MEM | GPC-Memory |
| G-V | Gravity-Velocity |
| G/A | Ground-to-Air |
| G/E | Graphite Epoxy |
| G/G | Ground-to-Ground |
| G/S | Guided Steering |
| G/T | Antenna Gain-to-Noise Temperature Ratio |
| G02 | GaG02Gaseous Oxygen |
| GA | Gage |
| GA | General Assembly |
| GA | Glide Angle |
| GA | Gyro Assembly |
| GA&CS | Ground Acquisition And Command Station |
| GAC | Ground Attitude Control |
| GAC | Grumman Aerospace Corporation |
| GACU | Ground Air Conditioning Unit |
| GACU | Ground Avionics Cooling Unit |
| GAIN | Graphic Aids For Investigating Networks |
| GAM | Gamma |
| GAO | General Accounting Office |
| GAP | GOAL Automatic Procedure |
| GAPL | Group Assembly Parts List |
| GAS | Get-Away Special |
| GASPI | Guidance Attitude Space Position Indicator |
| GATP | Ground Acceptance/Article Test Procedure |
| GATT | Gate Assisted Turnoff Thyristor |
| GBI | Grand Bahama Island |
| GBL | Government Bill Of Lading |
| GBR | Glass Bead Rating |
| GBS | Ground Based Software |
| GC | Gigacycles (1000 Megacycles) |
| GC | Ground Control |
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