NS
- I, Robot
- NS record
- Name server
- Namespace
- Nanosecond
- Nanostructure
- Nasjonal Samling
- NationStates
- National Alliance (Lithuania)
- National Security Department
- National Semiconductor
- National school (Ireland)
- National service
- Natural Selection (video game)
- Nazism
- NeXTSTEP
- Nederlandse Spoorwegen
- Negeri Sembilan
- Neighbor Discovery Protocol
- Nervous system
- Neutron star
- New Serbia (political party)
- New Shepard 3
- New Slovenia
- New Spring
- New Style
- Newton second
- Nintendo Switch
- Norfolk Southern Railway
- Norfolk Southern Railway (1942–1982)
- Normal saline
- Nova Scotia
- Novi Sad
- Néron–Severi group
- People's Party (Montenegro)
- People's Party (Serbia, 2017)
- Standard Norge
- Statistical significance