KSFI (100.3 FM) is a radio station in Salt Lake City, Utah, United States.

KSFI maintains studio facilities located at the KSL Broadcast House building in Salt Lake City's Triad Center (which also house KRSP-FM and the KSL-AM-FM-TV partners), and its transmitter is located on Farnsworth Peak in the Oquirrh Mountains, southwest of Salt Lake City.

On October 31, 1940, the Federal Communications Commission (FCC) awarded the first fifteen commercial FM station construction permits, including an assignment for Salt Lake City on 44.7 MHz to the Radio Service Corporation of Utah, which was also the licensee of AM station KSL.

In early 1941, the FCC began an investigation whether newspaper ownership of radio stations should be restricted,[3] which put K47SL's authorization on hold, because approximately twenty percent of Radio Service Corporation of Utah stock was held by the publisher of the Salt Lake Tribune and Salt Lake Telegram newspapers.

Originally owned by the Deseret News, it became a part of Bonneville International when the Latter Day Saints Church formed it as the parent of its broadcasting outlets in 1964.