Corsica et Sardinia was an ancient Roman province including the islands of Corsica and Sardinia.

The Phoenicians were the first to establish several commercial stations in Corsica and in Sardinia. After the Phoenicians, there arrived the Greeks, who also established their colonies. The Carthaginians(phoenician colony), with the help of the Etruscans, conquered the greek colony of Alalia, on Corsica, in 535 BC. After Corsica, Sardinia also came under control of the Carthaginians.

Even though Rome had drawn up an earlier treaty with Carthage, a complete disregard to this agreement led them to forcibly annex Corsica and Sardinia during the First Punic War. In 238 BC, the Carthaginians, accepting defeat in the First Punic War, surrendered Corsica and Sardinia, which together became a province of Rome. This marked the beginning of Roman domination in the Western Mediterranean. The Romans ruled this area for 694 years.

Throughout this rule, Rome maintained an objective relationship with the province. The coastal regions of both islands were settled by Romans and adopted the Latin language and culture; however, the interior areas of Corsica and Sardinia resisted the Romans. A variety of revolts and uprisings occurred: however, since the interior areas were densely forested, the Romans avoided them and set them aside as the “land of the barbarians”. Overall, Corsica and Sardinia became trivial gains compared to the Roman Empire’s Eastern gains. From Sardinia, the Romans did not receive much spoil nor were the prisoners willing to learn anything Roman; a similar situation occurred in Corsica. It was said that “whoever has bought one [Corsican] regrets the waste of his money”. The Romans regarded the islands and their people as backward and unhealthy.

Corsica ( /ˈkɔːrsɪkə/; French: Corse, IPA: [kɔʁs]; Corsican: Corsica; Italian: Corsica, IPA: [ˈkɔrsika]) is a French island in the Mediterranean Sea. It is located west of Italy, southeast of the French mainland, and north of the Italian island of Sardinia. Mountains comprise two-thirds of the island, forming a single chain.

Corsica is one of the 27 régions of France, although strictly speaking Corsica is designated as a territorial collectivity (collectivité territoriale) by law. As a territorial collectivity, it enjoys greater powers than other French régions, but for the most part its status is quite similar. Corsica is referred to as a "région" in common speech, and is almost always listed among the other régions of France.

Although the island is separated from the continental mainland by the Ligurian Sea and is closer to Italy than to the French mainland, politically Corsica is part of Metropolitan France. It was once briefly an independent Corsican Republic, until being incorporated into France in 1769. Its culture has French and Italian elements blended into it.

Sardinia ( /sɑrˈdɪniə/, Italian: Sardegna [sarˈdeɲɲa], Sardinian: Sardigna [sarˈdinja]) is the second-largest island in the Mediterranean Sea (after Sicily and before Cyprus). It is an autonomous region of Italy, and the nearest land masses are (clockwise from north) the French island of Corsica, the Italian Peninsula, Sicily, Tunisia and the Spanish Balearic Islands.

The name Sardinia is from the pre-Roman noun *sard[], romanised as sardus (feminine sarda); that the name had a religious connotation is suggested from its use also as the adjective for the ancient Sardinian mythological hero-god Sardus Pater "Sardinian Father" (misunderstood by many modern Sardinians/Italians as being "Father Sardus"), as well as being the stem of the adjective "sardonic". Sardinia was called Ichnusa (the Latinised form of the Greek Hyknousa), Sandalion, Sardinia and Sardo by the ancient Greeks and the Romans.

Sardinia is the second-largest island in the Mediterranean Sea, with an area of 23,821 km². It is situated between 38° 51' and 41° 15' latitude north and 8° 8' and 9° 50' east longitude. To the west of Sardinia is the Sea of Sardinia, a unit of the Mediterranean Sea; to Sardinia's east is the Tyrrhenian Sea, which is also an element of the Mediterranean Sea.