Sardinia ( sar-DIN-ee-ə; Italian: Sardegna [sarˈdeɲɲa]; Sardinian: Sardigna [saɾˈdiɲːa]) is the second-largest island in the Mediterranean Sea, after Sicily, and one of the 20 regions of Italy. It is located west of the Italian Peninsula, north of Tunisia and immediately south of the French island of Corsica.

It is one of the five Italian regions with some degree of domestic autonomy being granted by a special statute. Its official name, Autonomous Region of Sardinia, is bilingual in Italian and Sardinian: Regione Autonoma della Sardegna / Regione Autònoma de Sardigna. It is divided into four provinces and a metropolitan city. The capital of the region of Sardinia — and its largest city — is Cagliari.

Sardinia's indigenous language and Algherese Catalan are referred to by both the regional and national law as two of Italy's twelve officially recognized linguistic minorities, albeit gravely endangered, while the regional law provides some measures to recognize and protect the aforementioned as well as the island's other minority languages (the Corsican-influenced Sassarese and Gallurese, and finally Tabarchino Ligurian).

Owing to the variety of Sardinia's ecosystems, which include mountains, woods, plains, stretches of largely uninhabited territory, streams, rocky coasts, and long sandy beaches, Sardinia has been metaphorically described as a micro-continent. In the modern era, many travelers and writers have extolled the beauty of its long-untouched landscapes, which retain vestiges of the Nuragic civilization.