NRS
- JANET NRS
- NRS process
- NRS social grade
- National Readership Survey
- National Records of Scotland
- National Reporter System
- National Retail Systems
- National Runaway Switchboard
- Nederlandsche Rhijnspoorweg-Maatschappij
- Nevada Revised Statutes
- Nil Ratan Sircar Medical College and Hospital
- Non-restorative sleep
- Norwegian Air UK
- Nuclear Restoration Services
- Numerical Rating Scale