| GA | Go Ahead | - | Chemistry |
| GA | Glauber Approximation (in Electron-atom Scattering) | - | Computer Acronyms(common) |
| GA | Genetic Algorithm | - | Computer Acronyms(common) |
| GA | Gage | - | Organizations |
| GA | General Assembly | - | Organizations |
| GA | Glide Angle | - | Organizations |
| GA | Gyro Assembly | - | Organizations |
| GA | Go Ahead | - | Sms Text Smileys and Emoticons |
| GA | Good Afternoon | - | Sms Text Smileys and Emoticons |
| GA | Go Ahead | - | ISO Country Codes |
| GA | Gabon (ISO 3166 Digram) - The Gambia (FIPS 10-4 Country Code) - Georgia (postal Symbol) - Gigaampere | - | Astronomy |
| GA | Gallium - Gigaannum | - | Astronomy |
| GA | Irish Language (ISO 639-1 Code) | - | Astronomy |
| GA | Billion Years Unit | - | Business and Finance |
