Arts and entertainment

New Star Soccer, a computer game
Newsstand Specials, a spinoff of Playboy magazine
Nintendo Super System, an arcade game cabinet that plays Super NES games
Northern Sound System, a youth music education centre and venue in Adelaide, South Australia
NSS, a 1958 computer chess program

Organizations

National Security Secretariat (United Kingdom), part of the Cabinet Office
National Security Service (disambiguation), the name of several intelligence services
National Seismological Service, an agency of the Mexican government
National Service Scheme, a Government of India-sponsored program for community service and social activities
National Statistical Service of the Republic of Armenia, former name of the Statistical Committee of Armenia
NHS National Services Scotland, the central support agency to the NHS in Scotland

People's Socialist Party of Montenegro, a political party in the Republic of Montenegro
National Power Unity, a far-right party in Latvia
People's Peasant Party (Narodna seljačka stranka), a political party in Serbia

National Sport School (Canada), a high school in Alberta, Canada
Nauru Secondary School, a high school in Nauru
National Socialist Schoolchildren's League (Nationalsozialistischer Schülerbund), the organization for school pupils in the Third Reich
Northbrooks Secondary School, a secondary school in Yishun, Singapore
Northern Secondary School, a high school in Toronto, Canada

National Screen Service, an American company involved in cinema advertising
New Skies Satellites, the former name of the Dutch spacecraft operator SES NEW SKIES
Norsk Spisevognselskap, a dining car company of Norway

Nair Service Society, a community welfare organization for the Nair community from Kerala, India
National Space Society, an international space advocacy organization
National Sculpture Society, US
National Secular Society, a British organization
National Speleological Society, an American organization
Nilachala Saraswata Sangha, a religious organization
National Service Scheme, Indian government-sponsored public service programme

For government bodies, see § Government bodies.

For political parties, see § Political parties.

National Security Strategy (United States)
National Shelter System, a database of emergency shelters in the US administered by the Federal Emergency Management Agency
National Student Survey, a survey of final-year degree students in the UK
Nuclear Security Summit, a summit on nuclear security established by US President Obama

Name Service Switch, a technology used in UNIX
Namespace Specific String, a part of the syntax of a Uniform Resource Name
Network Security Services, cryptographic software libraries for client and server security
Network switching subsystem, a component of the mobile-phone network
Novell Storage Services, a file system used by the Novell NetWare operating system
NSS, a 1958 computer chess program

Neurological soft signs, signs of disturbance in neurology
Neutral salt spray, a salt spray test to qualify the corrosion resistance of coatings on metal
Normal saline solution, in medicine
NSS Annapolis, a US Navy VLF and HF radio transmitter site in Annapolis, Maryland