Founded in 1916, it plays in Tercera División – Group 2, holding home matches at Estadio El Bayu, with a capacity of 5,000 seats.

[4] With the creation of the Spanish football league system the club started playing in Tercera División at Estadio Luis Miranda.

Siero played three editions Copa del Rey, playing against La Liga teams like CA Osasuna or Sporting de Gijón.

It only played in the third tier during the 2000–01 season, where it was relegated after finishing in the 17th place of the Group 1.

Since its relegation, it is playing in Tercera División and Regional Preferente.