NK

NK may refer to:

Businesses

 * Imerys, a French mining multinational (Euronext ticker: )
 * Nordiska Kompaniet, a Swedish department store
 * Northrup-King Seed Company, U.S.
 * Spirit Airlines, U.S. (IATA: )
 * NK.pl, a Polish social network (2006–2021)

Organisations

 * Neturei Karta, a group of anti-zionist orthodox Jews
 * Nippon Kaiji Kyokai, a ship classification society
 * NK (nogomentni klub), a name suffix for Croatian and Slovenian football clubs

Places

 * North Korea, a country
 * Nagorno-Karabakh Republic, a de facto state (1991–2023)
 * Nikšić, Montenegro (license plate: )
 * North Kingstown, Rhode Island, U.S.
 * North Kingstown High School

Other uses

 * NK (singer), a Ukrainian singer
 * Naik (military rank), in certain South Asian armies
 * Natural killer cell, in medicine
 * Neue Kerze ('new candle'; nk), original name for the photometric unit the candela
 * Norwegian krone, a currency