| Abbreviation | Definition |
|---|---|
| GCSI | Global Change Strategies International Inc. |
| GCSI | Government Contracting Specialists Inc |
| GCSI | Government Contracting Specialists, Inc, |
| GCSI | Governmental Consultant Services Inc. |
| GCT | German Company Tract |
| GCTC | Great Canadian Theatre Company |
| GCW | Green City Wageningen |
| GCXU | Ocean Network Express Holdings Ltd |
| GCZONE | Global CommerceZone |
| GD | Gantar & DeMartini, LTD., Law Firm |
| GD | Gemini Dynamics, L.L.C. |
| GD | Green Dot, LTD. |
| GDA | Grangegorman Development Agency |
| GDAR | Greater Dallas Association of Realtors |
| GDATech | Global Design and Automation Technologies |
| GDBC | Global Data Broadcasting Corporation |
| GDBC | Great Divide Brewing Company |
| GDC | Global Digital Consortium |
| GDC | Grout Dye Company |
| GDCC | Global Data Collection Company |