Gruppo Sportivo Dilettantistico Castelfidardo, commonly referred to as Castelfidardo, is an Italian football club based in Castelfidardo, Marche. Currently it plays in Italy's Serie D.
The club was founded in 1944.
In the season 2013–14 the team was promoted, from Eccellenza Marche to Serie D after winning the national play-off.
The team's colors are white and green.