Club Deportivo Cayón is a Spanish football club based in Santa María de Cayón, in the autonomous community of Cantabria. Founded in 1915, it plays in Tercera Federación – Group 3, holding home games at Estadio Fernando Astobiza, which has a capacity of 2,700 spectators.
In the 2017–18 season the club finished 6th in the Tercera División, Group 3. The following season CD Cayón improved its position by finishing 4th.