NIS
- Canadian Forces National Investigation Service
- Johnson (rapper)
- N-Iodosuccinimide
- NIS Directive
- Naftna Industrija Srbije
- Nagoya International School
- Nanjing International School
- National Institute of Science
- National Institute of Sports
- National Intelligence Service (Greece)
- National Intelligence Service (South Africa)
- National Intelligence Service (South Korea)
- National Intelligence Service (disambiguation)
- National innovation system
- Naval Investigative Service
- Nazarbayev Intellectual Schools
- Nederlandsch-Indische Spoorweg Maatschappij
- Ness, Lewis
- Network Information Service
- Network information system
- New Israeli Shekel
- Nickel sulfide
- Nippon Ichi Software
- Nis, Iran
- Niš
- Niš (boat)
- Norwegian Intelligence Service
- Norwegian International School
- Norwegian International Ship Register
- Nuclear Information Service
- Sodium-iodide symporter