CHK may refer to: CHK (TV channel), a television channel in Southeast Asia Chesapeake Energy, a major producer of natural gas Civil Hospital Karachi, Pakistan Chiswick railway station, England Christian Historical Voters' League (Dutch: ) Chuukese language .CHK, a filename extension used by the CHKDSK program Checksum Cheka (), Extraordinary Commission, Soviet secret police from 1917 till 1922