XHCAO-FM (89.1 MHz) is a radio station in Ciudad Camargo, Tamaulipas, Mexico, serving Reynosa, Tamaulipas and Rio Grande Valley, Texas.

XHCAO began on 101.7 FM, with a concession awarded to Liza Garza Acosta on August 16, 1994.

In 2000, it was sold to Radio BMP de Ciudad Camargo, around the same time it moved to 89.1 FM.

In April 2019, R Communications sold the Radio United stations in Mexico, including XHCAO, XHAVO, and XHRR, to Radio Ultra, S.A. de C.V., a company owned by the Bichara family.

The Federal Telecommunications Institute (IFT) approved the transfer on September 2, 2020.