XHUI-FM is a radio station on 99.1 FM in Comitán de Domínguez, Chiapas, in Mexico.

The station is owned by Radio Núcleo and carries its grupera format, known as Extremo Grupero.

XHUI began as XEUI-AM 1320, with a concession awarded on October 28, 1963.

In June 1968, the station was sold to Celia María Amador Carrillo de Partida.

In 1997, ownership passed to a corporation, and in the early 2000s XEUI moved to 800 and increased its power to 5,000 watts.