CIDR-FM is the callsign for a radio station, broadcasting at 93.9 FM in Windsor, Ontario. The station broadcasts an adult album alternative format using the brand name 93-9 The River. It is owned and operated by Bell Media. It is one of the few commercial adult album alternative stations in Canada and is the only one in Ontario, with the others located in British Columbia. It was also Canada's first AAA-formatted station at launch.