NK may refer to: Businesses Imerys (Euronext ticker code NK) Nordiska Kompaniet, a department store in Stockholm, Sweden Northrup-King Seed Company Spirit Airlines (IATA code NK) NK.pl, a Polish school-based social networking service Places Nagorno-Karabakh Republic, a de facto state in the Nagorno-Karabakh region Nikšić, Montenegro (license plate code NK) North Kingstown, Rhode Island, United States North Kingstown High School North Korea, a common name for the Democratic People's Republic of Korea (DPRK) Other uses Naik (military rank), rank in certain South Asian armies Natural killer cell, in medicine Neturei Karta, a group of anti-zionist orthodox Jews Neue Kerze aka new candle, an old photometric unit of luminous intensity Nippon Kaiji Kyokai, a classification society Norwegian krone, a currency NK (singer), a Ukrainian singer NK, nogomentni klub, a football club in Croatian and Slovenian (e. g. NK Osijek, NK Maribor)