RDI
- Ici RDI
- RDI Video Systems
- RDI register
- Radar Doppler Multifunction
- Rassemblement démocratique pour l'indépendance
- Reference Daily Intake
- Reflected DOM Injection
- Relationship Development Intervention
- Renew Democracy Initiative
- Resistance Database Initiative
- Respiratory disturbance index
- Response Dynamics
- Royal Designers for Industry
- Rural Development Institute