Organizations
- Nostalgia Super Stock Nostalgia Super Stock Drag Racing
- National Sculpture Society, Established in 1893 to "Spread the knowledge of good sculpture".
- Nigerian Student Society, a student society at Universities around the world.
- National Screen Service, an American company involved in cinema advertising
- National Space Society, an international space advocacy organization
- National Secular Society, a British organization
- National Security Service (United States), an office in the American FBI
- National Security Service (Maldives), the former name of the Maldivian armed forces
- National Security Service (Somalia), the former special police of Somalia during the rule of Siad Barre.
- NHS National Services Scotland, the central support agency to the NHS in Scotland
- National Seismological Service, Mexican agency of the Mexican government
- National Speleological Society, an American organization
- New Skies Satellites, the former name of the Dutch spacecraft-operator SES NEW SKIES
- People's Socialist Party of Montenegro, a political party in the Republic of Montenegro within the Serbian List
- National Power Unity, a far-right party in Latvia
- National Service Scheme, a Government of India sponsored program for community service and social activities.
- Nair Service Society, a Community welfare organization for the Nair Community from Kerala
- Nationalsozialistischer Schülerbund the organization for school pupils in the Third Reich
- National Statistical Service of the Republic of Armenia
- Norsk Spisevognselskap, a dining car company of Norway
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