| RRG | Rabbi Reuven Grodner 
| Others |
| RRG | Raging Rebel Gaming
| Others |
| RRG | RailRoad Generator Set
| Others |
| RRG | Ready for Revenue Generation
| Others |
| RRG | Rear Regulator
| Others |
| RRG | Recruiting Resource Group
| Others |
| RRG | Red Racing Green
| Others |
| RRG | Red River Gorge
| Others |
| RRG | Referral Resource Group
| Others |
| RRG | Regional Resource Group
| Others |
| RRG | Regular Research Grant
| Others |
| RRG | Regulatory Resources Group
| Others |
| RRG | Reinbolt Research Group
| Others |
| RRG | Relative Rotation Graphs
| Others |
| RRG | Religious Rehabilitation Group
| Others |
| RRG | Renault Retail Group
| Others |
| RRG | Requirements Review Group
| Others |
| RRG | Residents for Responsible Government
| Others |
| RRG | Resuscitation Research Group
| Others |
| RRG | Retail Realty Group, Inc.
| Others |
| RRG | Richie Ranno Group
| Others |
| RRG | Richmond Restaurant Group
| Others |
| RRG | Ricontro e Rettifiche Giornalien
| Others |
| RRG | Risk Reduction Graduate
| Others |
| RRG | Risk Retention Group
| Others |
| RRG | Risk Retention Groups
| Others |
| RRG | Robotics Research Group (University of Texas at Austin)
| Others |
| RRG | Robust Robotics Group
| Others |
| RRG | Rogue River Gold
| Others |
| RRG | Roker Record Group
| Others |
| RRG | Role and Reference Grammar
| Others |
| RRG | Rolls Royce Group
| Others |
| RRG | Routing Research Group
| Others |
| RRG | Rust Rewrite of GRR
| Others |