HNK

HNK may refer to:

• Croatian National Corpus (Croatian: Hrvatski nacionalni korpus)
• Croatian National Theatre (other) (Croatian: Hrvatsko narodno kazalište)
• Fist of the North Star (Japanese: Hokuto no Ken) a manga and its franchise
• Honokiol, a lignan
• Hydroxynorketamine, a metabolite of ketamine
• Land of the Lustrous (Japanese: Hōseki no Kuni) a manga
• Hrvatski nogometni klub, a number of Croatian football clubs have HNK in their official name