XHNNO-FM is a radio station in Naco, Sonora, Mexico, serving Agua Prieta, Sonora, and Douglas, Arizona, United States.

Broadcasting on 99.9 FM, XHNNO is owned by Grupo Radiofónico Zer and carries the Los 40 format from Radiópolis.

Until January 2021, the station carried the Exa FM pop format from MVS Radio.

The station began carrying the Los 40 format on February 3, 2021.

This article about a radio station in Sonora is a stub.