KKFS (103.9 MHz) is a commercial radio station licensed to Lincoln, California, and serving the Sacramento metropolitan area. The station carries a Christian contemporary radio format and is owned by the Salem Media Group. The station is branded as "103.9 The Fish" as Salem Media uses "The Fish" as its branding for Christian contemporary stations in Los Angeles, Atlanta, Nashville and Cleveland.

KKFS has an effective radiated power (ERP) of 6,000 watts. The transmitter is on Cherry Hill Road near Interstate 80 in Newcastle.

On November 8, 1974, the station first signed on the air. Its original city of license was Yuba City and it held the call sign KHEX.

In 2003, the station was sold to First Broadcasting which relaunched the station with an all 1980's music format and using the moniker "Flash 103.9".

In 2005, the station was sold to Bustos Media which then spun the station off to Salem Communications. Salem moved the company's "Fish" Christian contemporary music format over from 105.5 to 103.9. Then 105.5 flipped to a business news and information format as KSAC-FM.

In December 2024, it was announced that Salem Media sold KKFS and six other stations to Educational Media Foundation, the company that operates both the K-Love and Air1 networks. A few weeks later, it was announced that the station will begin airing the nationwide K-Love network, with operation under EMF beginning February 1, 2025.

• 103.9 The Fish official website
• Facility details for Facility ID 56366 (KKFS) in the FCC Licensing and Management System
• KKFS in Nielsen Audio's FM station database

38°52′34″N 121°07′34″W / 38.876°N 121.126°W / 38.876; -121.126