CHTZ-FM (97.7 MHz) is a commercial FM radio station in St. Catharines, Ontario, Canada, serving the Niagara Region. It is owned by Bell Media and it broadcasts an active rock format, branded as 97.7 HTZ-FM (pronounced "Hits FM"). CHTZ shares studios with its sister stations, CKTB and CHRE-FM, in "Oak Hill Mansion", the former home of William Hamilton Merritt, at 12 Yates Street in downtown St. Catharines. CHTZ-FM has an effective radiated power (ERP) of 50,000 watts. The transmitter is on Cataract Road in Thorold, sharing its tower with CHRE-FM.