| Ga | Gallium |
| GAC | Granular Activated Carbon |
| GAE | Gas-assisted Etch |
| GASAD | Gate And Source And Drain |
| GC | Gas Chromatography |
| GC | Gravimetric Calibrator |
| GCC | Generic Cell Controller |
| GCD | Gas Chromatography Distillation |
| GCIB | Gas Cluster Ion Beam |
| GCMS | Gas Chromatography Mass Spectroscopy |
| GCR | Generalized Cambridge Ring |
| Gd | Gadolinium |
| GDP | Gas Distribution Plate |
| GDPP | Gas Drive Plasma Pinch |
| GDS | Graphical Design System |
| GDS | Graphical Design Software |
| Ge | Germanium |
| GEM | Generic Equipment Model |
| GEMVS | GEM Verification System |
| GES | Generic Equipment Simulator |
| GFA | Gas Fusion Analysis |
| GFAAS | Graphite Furnace Atomic Absorption Spectroscopy |
| GFAAS | Graphite Furnace Atomic Absorption Spectrometry/spectroscopy |
| GFC | Gas Filter Correlation |
| GFCI | Ground Fault Circuit Interrupter |
| GFIS | Gas Field Ion Source |
| GHG | Greenhouse Gas |
| GI | Global Irrigation |
| GI-XRD | Grazing Incidence X-ray Diffraction |
| GIDL | Gate-induced Drain Leakage |
| GILD | Gas Immersion Laser Doping |
| GISAXS | Grazing Incidence Small-angle X-ray Scattering |
| GJG | Global Joint Guidance |
| GLC | Gas Liquid Chromatography |
| Gm | Transconductance |
| GOF | Goodness Of Fitness |
| GOI | Gate Oxide Integrity |
| GOX | Gate Oxide |
| GPIB | General Purpose Interface Bus |
| GPL | Gas Path Length |
| GPS | Global Positioning System |
| GRC | Gas Reactor Column |
| GRTV | Graphite Rapid Thermal Vulcanization |
| GSCE | Gas Source Control Equipment |
| GSED | Gaseous Scattered Electron Detector |
| GSPID | Gain-scheduled Proportional Integro-differential |
| GTS | GEM Test System |
| GUI | Graphical User Interface |
| GWIM | Global Warming Impact Model |
| GWLE | Good Wafer Level Exposure |
| GWP | Global Warming Potential |