NSS
- NHS National Services Scotland
- NS (disambiguation)
- NSS Annapolis
- Nair Service Society
- Name Service Switch
- Namespace Specific String
- National Power Unity
- National Screen Service
- National Sculpture Society
- National Secular Society
- National Security Council (United Kingdom)
- National Security Service (disambiguation)
- National Security Strategy (United States)
- National Security System
- National Seismological Service
- National Service Scheme
- National Shelter System
- National Socialist Schoolchildren's League
- National Space Society
- National Speleological Society
- National Sport School (Canada)
- National Statistical Service of the Republic of Armenia
- National Student Survey
- Nauru Secondary School
- Network Security Services
- Network switching subsystem
- Neurological soft signs
- New Skies Satellites
- New Star Soccer
- Newsstand Specials
- Nilachala Saraswata Sangha
- Nintendo Super System
- Norsk Spisevognselskap
- Northbrooks Secondary School
- Northern Secondary School
- Northern Sound System
- Nostalgia Super Stock
- Novell Storage Services
- Nuclear Security Summit
- People's Peasant Party
- People's Socialist Party of Montenegro
- Saline (medicine)