| Abbreviation | Definition |
|---|---|
| G.A.T.E. | Graduate Aptitude Test In Engineering |
| G.C.F. | Greatest Common Factor |
| G.N.P. | Gross National Product |
| GA | Gallium |
| GA | Gibberellic Acid |
| GA | Gastric analysis |
| GA | General Anesthesia |
| GA | General Appearance |
| GA | Gestational Age |
| GA | General Anaesthetic |
| GA | General of the Army |
| GA | Gyro Assembly |
| GA | Glide Angle |
| GA | General Assembly |
| GA | Giga Annum |
| GAA | General Accredited Appraiser |
| GAAA | General Aviation Activity and Avionics |
| GAAFR | "Governmental Accounting, Auditing, and Financial Reporting" |
| GAAP | Generally Accepted Accounting Practices |
| GAAP | General Accepted Accounting Principles |
| GAAP | Generally Accepted Accounting Principles |
| GAAS | Generally Accepted Auditing Standards |
| GAB | General Agreement to Borrow |
| GABA | Gamma Amino Butyric Acid |
| GAC | Generic Artificial Consciousness |
| GAC | Graphic Adventure Creator |
| GAC | Global Assessment Certificate |
| GAC | Grumman Aerospace Corporation |
| GAC | Ground Attitude Control |
| GAC | Global Area Coverage |
| GAC | Granular Activated Carbon |
| GACU | Ground Avionics Cooling Unit |
| GACU | Ground Air Conditioning Unit |
| GAD | General Anxiety Disorder |
| GAD | Generalized Anxiety Disorder |
| GAD | Generalised Anxiety Disorder |
| GAD | Graft Arterial Disease |
| GAD | Global Architectural Development |
| GADG | Global Animal Data Group |
| GADO | General Aviation District Office |
| GADS | Gilliam Asperger Disorder Scale |
| GAF | Growing Annuity Factor |
| GAFC | Great American Fish Count |
| GAFC | Genesee Area Focus Council |
| GAGAS | Generally Accepted Government Auditing Standards |
| GAIA | Global Astrometric Interferometer For Astrophysics |
| GAIL | Gas Authority of India Limited |
| GAIN | Graphic Aids for Investigating Networks |
| GAIN | Greater Avenues for Independence |
| GAIN | Government Agency Intelligence Network |