KYKY is an FM radio station serving the St. Louis, Missouri radio market. The current format of the station is Adult Top 40. It operates at 98.1 MHz. KYKY is owned by CBS Radio, which also owns soft rock station KEZK-FM and the market's dominant news, talk and sports station, KMOX-AM. KYKY operates from studios located on Market St., east of U.S. 40/I-64, and transmits from an FM radio tower in Shrewsbury, Missouri.

KYKY began as KSTL-FM around 1960; KSTL-FM was sold in 1967 and changed to KRCH-FM, but changed its call-letters to KSLQ five years later when it was purchased by Charter Communications. Charter had owned legendary AM Top 40 stations such as KCBQ in San Diego and WOKY in Milwaukee and was enjoying huge ratings with WDRQ-FM in Detroit in the fast growing FM Top 40 format of the 1970s. KSLQ later adjusted its format to adult contemporary around 1981 and the call letters were changed once more in October 1982 to the current KYKY (Y98). Shortly thereafter, KYKY was purchased by EZ Communications who maintained the Adult Contemporary format.