RBI
- R.B.I. Baseball
- Radio Berlin International
- Raiffeisen Bank International
- Reactive business intelligence
- Reed Business Information
- Relative bearing indicator
- Reserve Bank of India
- Restaurant Brands International
- Reviving Baseball in Inner Cities
- Risk-based inspection
- Royal Black Institution
- Rubidium iodide
- Run batted in
- Ruđer Bošković Institute