CJCB is a Canadian radio station broadcasting from Sydney, Nova Scotia at 1270 AM. The station is the third oldest radio station in Nova Scotia, hitting the airwaves on February 14, 1929. The station's current format is country. CJCB is the only commercial radio station in Canada to broadcast on 1270 AM. The station is owned and operated by the Maritime Broadcasting System, a company that owns several other radio stations in Nova Scotia, New Brunswick, and Prince Edward Island. CKPE-FM and CHER-FM are its sister stations. CJCB is the current broadcast partner of the Cape Breton Eagles hockey team of the QMJHL.

CJCB became an affiliate of CBC Radio when it launched in 1936. It was affiliated with the Trans-Canada Network until 1948, when it transferred its affiliation to the CBC's second network, the Dominion Network. When the Dominion Network dissolved in 1962, the station became independent.

CJCB played a wide variety of formats Adult Contemporary, Oldies, Top 40 etc., prior to switching formats with longtime country station CKPE-FM in June 1998 after MBS took over the stations. Over the years, CJCB used monikers such as "The Spirit of Cape Breton", "Cape Breton's Variety Station", "Cape Breton's Superstation", and "Cape Breton's Country Favorites".