CKSY-FM (94.3 MHz) is a commercial radio station in Chatham-Kent, Ontario.

Owned by Blackburn Radio, it broadcasts an adult contemporary format for Southwestern Ontario.

CKSY aired easy listening music branded as Cosy, which evolved into a soft adult contemporary format by the mid-1990s.

It adopted a brighter, more contemporary music mix, while remaining within the boundaries of the AC format.

In 2014, sister station CKUE-FM discontinued its active rock sound for a soft AC format.