RIS
- R. I. S. – Die Sprache der Toten
- R.I.S, police scientifique
- RDS Info
- RI (disambiguation)
- RIS (file format)
- RIS Delitti Imperfetti
- Radio Information Service
- Radiological information system
- Radiologically isolated syndrome
- Rail Integration System
- Remote Installation Services
- Reverse Image Search
- Reviving the Islamic Spirit
- Rishiri Airport
- Rishton railway station
- Riverside Indian School
- Rivian
- Ruamrudee International School
- SIOS
- Stout
- United States of Indonesia