SJK may refer to:
Kemi Sámi (ISO 639-3 code) São José dos Campos Regional Airport (IATA airport code) in Brazil Seinäjoen Jalkapallokerho, association football club from Seinäjoki, Finland San Juan Knights, a professional basketball team from San Juan, Philippines Shinjuku Station, JR East station code St. John's-Kilmarnock School, Breslau, Ontario, Canada