NK

NK my refer to

Businesses

• Spirit Airlines

Places

• Nagorno-Karabakh Republic a de facto state in the Nagorno-Karabakh region
• Nikšić Montenegro (license plate code NK)
• North Korea a common name for the Democratic People's Republic of Korea (DPRK)

Other uses

• Natural killer cell , in medicine
• Neue Kerze aka new candle, an old photometric unit of luminous intensity
• NK, nogomentni klub, a Football team in Croatian and Slovenian (e. g. (N.K. Osijek), NK Maribor