CFSX is an AM radio station in Stephenville, Newfoundland and Labrador, Canada, broadcasting at 870 kHz. Originally launched as a repeater on November 13, 1964, it opened its own studios in 1970. The station is owned by Newcap Broadcasting. In 1985, CFSX moved from 910 AM to its current frequency 870 AM. CFSX operates as a daytime station, and serves as a nighttime repeater to CFCB in Corner Brook.