is a professional Spanish football team based in Castellón de la Plana, in the Valencian Community.

Founded on 20 July 1922, it currently plays in Segunda División, holding home games at Nou Estadi Castàlia, which has a capacity of 15,500 seats.

In the 2004–05 season, Castellón finished fourth in Segunda B, eventually winning its promotion playoffs (both matches) and achieving a return to the silver category.

The club's stint in the division would last five years, as relegation would befall in 2009–10, with the Valencian Community outfit ranking last, 13 points behind the following team.

[2] In June 2017, former player Pablo Hernández became joint owner of the club, leading a consortium alongside Angel Dealbert, businessman Vicente Montesinos and others.