CKDO (1580 kHz) is a commercial AM radio station in Oshawa, Ontario, Canada, serving the eastern suburbs of the Greater Toronto Area.

In February 2001, Corus tried adding CKDO to its short-lived talk radio network (also consisting of CHML in Hamilton, CFPL in London, CKRU in Peterborough, CFFX in Kingston and CJOY in Guelph), but the station returned to the oldies format by the summer of that year.

[4] On August 13, 2006, CKDO moved from 1350 to 1580 kHz, taking over a Class A, clear-channel frequency and inheriting its protections against interference.

[5] The 1580 frequency had originally been the home of CBJ in Chicoutimi, Quebec, before that Ici Radio-Canada station migrated to the FM dial.

The CKDO call sign was previously used by an unrelated station in Baie-Comeau, Quebec, which operated at 92.5 FM from 1988 to 1991.