| Abbreviation | Definition |
|---|---|
| GSA | General Services Administration (U.S.) |
| GSA | Global Strategic Alliance |
| GSC | General Service Conference |
| GSCIS | Global Sustainable Competitiveness Index |
| GSI | Gross Spendable Income |
| GSM | Grants Solicitation and Management |
| GSOA | Government Surplus On-line Auction |
| GSOC | Global Security Operations Center |
| GSR | Government Social Research |
| GST | Generation-Skipping Transfer |
| GT | Good Times |
| GT | Grand Tourism |
| GT | Great Times |
| GTC | Government Travel Card |
| GTD | Getting Things Done |
| GTTS | Going To The Sun Road, Glacier National Park |
| GU | Geographically Undesirable |
| GU | Guam |
| GUBU | Grotesque Unbelievable Bizarre Unprecedented |
| GUDID | Global Unique Device Identification Database |