| G | Giga (Billion) | - | Organizations |
| G | Gravity | - | Organizations |
| G | Units Of Gravitational Force | - | Organizations |
| G | IWG Ground Interface Working Group | - | Organizations |
| G | LOW Gross Lift-Off Weight | - | Organizations |
| G | LOW Ground Lift-Off Weight | - | Organizations |
| G | CCC Ground Control Computer Center | - | Organizations |
| G | F&PGases | - | Organizations |
| G&A | General And Administrative | - | Organizations |
| G&C | Guidance And Control | - | Organizations |
| G&N | Guidance And Navigation | - | Organizations |
| G&NGUIDANC | And Navigation | - | Organizations |
| G&NS | Guidance And Navigation Subsystem | - | Organizations |
| G-11 | Gulfstream 11 (Shuttle Training Aircraft) | - | Organizations |
| G-A | Ground-to-Air | - | Organizations |
| G-G | Ground-to-Ground | - | Organizations |
| G-MEM | General Memory | - | Organizations |
| G-MEM | GPC-Memory | - | Organizations |
| G-V | Gravity-Velocity | - | Organizations |
| G/A | Ground-to-Air | - | Organizations |
| G/E | Graphite Epoxy | - | Organizations |
| G/G | Ground-to-Ground | - | Organizations |
| G/S | Guided Steering | - | Organizations |
| G/T | Antenna Gain-to-Noise Temperature Ratio | - | Organizations |
| G02 | GaG02Gaseous Oxygen | - | Organizations |
| GA | Gage | - | Organizations |
| GA | General Assembly | - | Organizations |
| GA | Glide Angle | - | Organizations |
| GA | Gyro Assembly | - | Organizations |
| GA&CS | Ground Acquisition And Command Station | - | Organizations |
| GAC | Ground Attitude Control | - | Organizations |
| GAC | Grumman Aerospace Corporation | - | Organizations |
| GACU | Ground Air Conditioning Unit | - | Organizations |
| GACU | Ground Avionics Cooling Unit | - | Organizations |
| GAIN | Graphic Aids For Investigating Networks | - | Organizations |
| GAM | Gamma | - | Organizations |
| GAO | General Accounting Office | - | Organizations |
| GAP | GOAL Automatic Procedure | - | Organizations |
| GAPL | Group Assembly Parts List | - | Organizations |
| GAS | Get-Away Special | - | Organizations |
| GASPI | Guidance Attitude Space Position Indicator | - | Organizations |
| GATP | Ground Acceptance/Article Test Procedure | - | Organizations |
| GATT | Gate Assisted Turnoff Thyristor | - | Organizations |
| GBI | Grand Bahama Island | - | Organizations |
| GBL | Government Bill Of Lading | - | Organizations |
| GBR | Glass Bead Rating | - | Organizations |
| GBS | Ground Based Software | - | Organizations |
| GC | Gigacycles (1000 Megacycles) | - | Organizations |
| GC | Ground Control | - | Organizations |
| GC | Guidance Control | - | Organizations |
| GC | Gyrocompassing | - | Organizations |
| GCA | Ground Controlled Approach | - | Organizations |
| GCC | Ground Control Center | - | Organizations |
| GCC | Ground Communications Coordinator | - | Organizations |
| GCCO | Ground Control Checkout | - | Organizations |
| GCD | Gyrc)-Compass | - | Organizations |
| GCDC | Ground Checkout Display And Control | - | Organizations |
| GCDCS | Ground Checkout Display And Control System | - | Organizations |
| GCE | Ground Checkout Equipment | - | Organizations |
| GCF | Ground Communications Facility | - | Organizations |
| GCHX | Ground Cooling Heat Exchanger | - | Organizations |
| GCI | Ground Controlled Interception | - | Organizations |
| GCIL | Ground Command Interface Logic | - | Organizations |
| GCIL | Ground Control Interface Logic | - | Organizations |
| GCILC | Ground Command Interface Logic Controller | - | Organizations |
| GCILU | Ground Control Interface Logic Unit | - | Organizations |
| GCL | Ground Coolant Loop | - | Organizations |
| GCL | Ground Control Landing | - | Organizations |
| GCN | Ground Communications Network (A/G Worldwide Net) | - | Organizations |
| GCN | Ground ControlNetwork | - | Organizations |
| GCO | Ground Checkout | - | Organizations |
| GCOS | General Computer Operational System | - | Organizations |
| GCOS | Ground Computer Operating System | - | Organizations |
| GCR | Ground Controlled Radar | - | Organizations |
| GCS | Ground Communications System | - | Organizations |
| GCS | Guidance Cutoff Signal | - | Organizations |
| GCTS | Gas Component Test Stand | - | Organizations |
| GCTS | Ground Communication(s) Tracking System | - | Organizations |
| GCU | General Control Unit | - | Organizations |
| GCU | Generator Control Unit | - | Organizations |
| GCU | Ground Cooling Unit | - | Organizations |
| GCU | Gyro Coupling Unit | - | Organizations |
| GCV | Gaseous Oxygen Control Valve | - | Organizations |
| GD | Guard | - | Organizations |
| GDA | Gimbal Drive Actuator/Assembly | - | Organizations |
| GDBS | Generalized Data Base System | - | Organizations |
| GDC | General Dynamics Convair | - | Organizations |
| GDC | Gyro Display Coupler | - | Organizations |
| GDP | Generalized Documentation Processor | - | Organizations |
| GDS | Goldstone | - | Organizations |
| GDS | GNC Dynamic Simulator | - | Organizations |
| GDSD | Ground Data SYstems Division | - | Organizations |
| GDSM | Ground Data Systems Manager | - | Organizations |
| GDSO | Ground Data Systems Officer | - | Organizations |
| GDSSR | GDSD Staff Support Room | - | Organizations |
| GDX | Goldstone | - | Organizations |
| GE | General Electric | - | Organizations |
| GECALL | GCOS Program Element Name | - | Organizations |
| GEDAC | General Electric Detection And Automatic Correction | - | Organizations |
| GEN | Generate | - | Organizations |
