NBK may refer to any one of the following:

• Nabeya Bi-tech Kaisha, a Japanese company
• Nandamuri Balakrishna, an Indian actor and politician
• National Bank of Kenya
• National Bank of Kuwait
• Natural Born Killers, a 1994 motion picture
  • Natural Born Killers also "inspired" many copycat crimes often attributed to the film
• Neuer Berliner Kunstverein, the New Berlin Art Association
• Nordhordland B.K., a Norwegian football club
• Suvarnabhumi Airport, Bangkok, Thailand, temporary IATA code c.2006
• Nastyboy Klick, the former name of hip hop group NB Ridaz
• Nükleer Başlıklı Kız, a Turkish band from Ankara
• A type of identifier used by NCBI Bookshelf