HJK may stand for:

• HJK Helsinki (Helsingin Jalkapalloklubi), association football club from Helsinki, Finland
• Hærens Jegerkommando, the armed forces competence center for commando, airborne, and counterterrorist duty in the Norwegian Army

• Waitaki by-election, 1880
• Waitaki by-election, 1962
• Waitaki District Council building
• Waitakitahuna-ki-te-Toka
• Waitakitāhuna-ki-te-Toka
• Wait a minute, wait a minute. You ain't heard nothin' yet
• Wai T'an
• Waitan Bridge station
• Waitan Bridge Station
• Wai T'an Customs Building
• Wait and Return EP
• Waitangitahuna River
• Waitangitāhuna River
• Waitangi Upper Marae
• Waitara Bears
• Waitard
• Waita Setu
• Wait Block
• WaitButWhy
• Wait But Why
• @waitbutwhy
• Wait by the River
• Wait Calculation
• Wait calculation
• Wait (Chantel Jeffries song)