CIDC-FM, branded as Z103.5, is a rhythmic contemporary radio station licensed to Orangeville, Ontario and serving the Greater Toronto Area. Owned by Evanov Communications, the station broadcasts on 103.5 MHz FM with an effective radiated power of 30,700 watts.

Z103.5 launched in 1987 and has historically been known for its dance and electronic music-leaning format. The station's current format focuses on contemporary hit radio and rhythmic music. Some of Z103.5's popular programs include the morning show with Scott Fox and Kat Callaghan, the Wayback Lunch featuring hits from the 80s, 90s and early 2000s, and the Drive @ 5 Street Mix with DJ Danny D.

The station hosts annual concert events like Summer Rush and has sponsored electronic music events and dance music compilations over the years. Z103.5 aims to provide listeners with the latest hit music and entertainment targeting a young adult demographic in the Toronto area.