| GRG | Gainesville Rock Gym 
| Others |
| GRG | Gardez, Afghanistan
| Others |
| GRG | Garretts Rockin Group
| Others |
| GRG | Gastroenterology Research Group
| Others |
| GRG | Gazoo Racing Garage
| Others |
| GRG | General Relativity and Gravitation
| Others |
| GRG | Generalised Reduced Gradient
| Others |
| GRG | Generalized Reduced Gradient
| Others |
| GRG | Georges River Grammar
| Others |
| GRG | Gerontology Research Group
| Others |
| GRG | Gerry R Ghearing
| Others |
| GRG | Glacier Restaurant Group
| Others |
| GRG | Glass Reinforced Gypsum
| Others |
| GRG | GlenRock Group, Ltd.
| Others |
| GRG | Global Relationship Group
| Others |
| GRG | Global Research Group
| Others |
| GRG | Global Resource Group, Inc.
| Others |
| GRG | Global Restructuring Group
| Others |
| GRG | Glyphosate Renewal Group
| Others |
| GRG | Go Rangers Go
| Others |
| GRG | Goodman Research Group
| Others |
| GRG | Graduate Research Grant
| Others |
| GRG | Grand Rapids Gymnastics
| Others |
| GRG | Grandparents Raising Grandchildren
| Others |
| GRG | Graphical Residual Gradient
| Others |
| GRG | Graphical Residual Gradientb
| Others |
| GRG | Grassroots Reconciliation Group
| Others |
| GRG | Gravity Recoverable Gold
| Others |
| GRG | Great Rivers Greenway
| Others |
| GRG | Great Running Game
| Others |
| GRG | Gridded Reference Graphic
| Others |
| GRG | Gurung River Guides
| Others |
| GRG | Gus Rumour Gucci
| Others |