Sirolo is a comune in the Province of Ancona in the Italian region of Marche. As of 28 February 2009 it had a population of 3,747 inhabitants and an area of 16.68 square kilometres. The town is situated near Monte Conero and in medieval times it was a castle which belonged to the Conti Cortesi family. It is a tourist destination, especially in summer times and it has continuously been awarded one of the eleven blue flags in the region of Marche since 1994.