HJK may stand for:
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Helsingin Jalkapalloklubi
Helsingin Jalkapalloklubi (), commonly known as HJK Helsinki, or simply as HJK, is a professional football club based in Helsinki, Finland. The club competes in the Finnish Veikkausliiga. Founded in 1907, the club has spent most of its history i ...
(HJK Helsinki), an association football club, Finland
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Helsingin Jalkapalloklubi (women), an association football club, Helsinki, Finland
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Helsingin Jääkiekkoklubi (HJK Helsinki), Finnish ice hockey club.
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Hærens Jegerkommando
Hærens Jegerkommando was a special forces unit of the Norwegian military. It was the armed forces competence centre for commando, airborne and counter terrorist duty in the Norwegian Army. Its headquarters were located 30 kilometres north ...
, Norwegian special forces unit
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