RRA
- Internal Revenue Service Restructuring and Reform Act of 1998
- Participatory rural appraisal
- RRD Editor
- Radioreceptor assay
- Rahanweyn Resistance Army
- RailAmerica
- Red Ribbon Army
- Reiulf Ramstad Arkitekter
- Religious Research Association
- Revenue Reconciliation Act of 1993
- Richardson Racing Automobiles
- Road Records Association
- Rock River Arms
- Routing and Remote Access Service
- Rural Reconstruction Association
- Russell Reynolds Associates