GA
- Ga – (s) Gallium – Gigaannum
- GA – (s) Gabon (ISO 3166 digram) – The Gambia (FIPS 10-4 country code) – (i) Gamblers Anonymous – Georgia (postal symbol) – Gigaampere – Goa (Indian state code)
- GAAR – (a) General Anti-Avoidance Rule (tax evasion)
- GAB – (s) Gabon (ISO 3166 trigram)
- GABA – (i) Gamma-AminoButyric Acid
- GAD – (a) Generalized Anxiety Disorder
- GAF – (i) Garfield and Friends
- GALCIT – (a) Guggenheim Aeronautical Laboratory, California Institute of Technology
- GAO – (i) U.S. Government Accountability Office
- GAW – (i) Global Atmospheric Watch
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