| Acronym | Definition |
|---|
| RGI | Référentiel Général d'Interopérabilité (French: General Repository for Interoperability) |
| RGI | Rent Geared to Income Housing (Canada) |
| RGI | Registrar General of India (census research) |
| RGI | Revenue Growth Index (finance) |
| RGI | Raw Gas Injection (petroleum engineering) |
| RGI | Ragnar Granit Institute |
| RGI | Resource Group International |
| RGI | Rajiv Gandhi International Airport (India) |
| RGI | Royal Group, Inc. (clothing manufacturer) |
| RGI | Rumbaugh-Goodwin Institute for Cancer Research, Inc. (est. 1959; Plantation, FL) |
| RGI | Regional Geographical Initiative |
| RGI | Rail Gap Indicator (rail signal) |
| RGI | Radio Gate International (Aston, PA) |
| RGI | Resin-Modified Glass Ionomer (cement) |
| RGI | Reactant Gas Inlet |
| RGI | Richmond Group International (Virginia) |
| RGI | Ressources Globales en Informatique (French: Global Computer Resources; est. 1990) |