| Subject | English | Thesaurus |
| relig., abbr. | Lutheran Social Services of the National Capital Area | LSS-NCA |
| abbr. | National Air Traffic Control Services | NATCS |
| tradem., abbr. | National Assistance Services Australia | NASA |
| tradem., abbr. | National Association Credit Services | NACS |
| mil., abbr. | National Association For Uniformed Services | NAUS |
| univer., abbr. | National Association of College Auxiliary Services | NACAC |
| physiol., abbr. | National Association of Emergency Medicine Services Physicians | NAEMSP |
| ed., abbr. | National Association of State Directors of Pupil Transportation Services | NASDPTS |
| immunol., abbr. | National Center for Health Services Research and Development | NCHSRD |
| immunol., abbr. | National Center for Health Services Research and Development | NCHSR&D |
| abbr. | National Conference on Financial Services | NCFS |
| abbr., insur. | National Crop Insurance Services | NCIS |
| NGO, abbr. | National Education for Assistance Dog Services | NEADS |
| tradem., abbr. | National Equipment Services | NES |
| NYSE., abbr. | National Equipment Services, Inc. | NSV |
| IT, abbr. | National Federation of Abstracting and Information Services | NFAIS (organization, USA) |
| abbr. | National Federation of Science Abstracting and Indexing Services | NFSAIS (AGaliguzov) |
| abbr., med. | National Health Service Breast Screening Programme | NHSBSP (harser) |
| abbr., scottish | National Helicopter Services | NHS (Trinidad) |
| IT, abbr. | National Information on Software and Services | NISS (USA) |
| account., abbr. | National Information Services And Systems | NISS |
| abbr. | National Information Services & Systems | NISS (ABelonogov) |
| ocean., abbr. | National Institute of Environmental Health Services | NIEHS |
| USA | National Regulatory Services | NRS |
| USA | National Relay Services | NRS |
| tradem., abbr. | National Technology Services, Inc. | NTS |
| tradem., abbr. | National Technology Services, Inc. | NTSI |
| abbr., vet.med. | National Veterinary Services Laboratories | NVSL (iwona) |
| tradem., abbr. | Washington National Tax Services | WNTS |
