SJK

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