Giglio Castello is a village located in the Tuscany region of central Italy. Administratively, it serves as a frazione of the comune of Isola del Giglio within the province of Grosseto.
As of the 2001 census, the village had a population of 568 residents. It is recognized as one of the "Borghi più belli d'Italia," a designation highlighting its status as one of the most beautiful villages in the country.