Isola del Giglio, or Giglio Island in English, is an Italian island and comune (municipality) in the Tyrrhenian Sea, off the coast of Tuscany, and is part of the Province of Grosseto. The island is one of seven that form the Tuscan Archipelago, lying within the Arcipelago Toscano National Park. Giglio means "lily" in Italian, and though the name would appear consistent with the insignia of Medici Florence, it originally derives from the Latin name of the island, Igilium, which in turn could be related to the Ancient Greek name of the neighbouring Capraia, Αἰγύλιον, from αἴξ aíx "goat".

The province of Grosseto is a province in the Tuscany region of Italy. Its capital is the city of Grosseto. As of 2013 the province had a total population of 225,098 people.