Businesses and organizations[edit]
Naftna Industrija Srbije, Petroleum Industry of Serbia
Nagoya International School, a private school in Nagoya, Japan
Nanjing International School, school serving the expatriate community of Nanjing
National Institute of Sports, an educational center in India
National innovation system, which examines knowledge production in a firm
Nederlandsch-Indische Spoorweg Maatschappij (NIS)
Nishimachi International School, a private school in Tokyo, Japan
Nordic Integrated System, a type of ski binding in cross-country skiing
Norwegian International Ship Register, in Norwegian Norsk Internasjonalt Skipsregister
