The Catepanate (or Catapanate) of Italy (Greek: κατεπανίκιον Ἰταλίας Katepaníkion Italías) was a province of the Byzantine Empire, comprising mainland Italy south of a line drawn from Monte Gargano to the Gulf of Salerno. Amalfi and Naples, although north of that line, maintained allegiance to Constantinople through the catepan. The Italian region of Capitanata derives its name from the Catepanate.

Following the fall of the Exarchate of Ravenna in 751, Byzantium had been absent from the affairs of southern Italy for almost a century, but the accession of Basil I the Macedonian (reigned 867–886) to the throne of Constantinople changed this: from 868 on, the imperial fleet and Byzantine diplomats were employed in an effort to secure the Adriatic Sea from Saracen raids, re-establish Byzantine dominance over Dalmatia, and extend Byzantine control once more over parts of Italy. As a result of these efforts, Otranto was taken from the Saracens in 873, and Bari passed under Byzantine control in 876. The expeditions of the capable general Nikephoros Phokas the Elder in the mid-880s further extended Byzantine control over most of Apulia and Calabria. These victories were followed up by his successors and laid the foundation of a resurgence of Byzantine power in southern Italy, culminating in the establishment of the theme of Longobardia in ca. 892. The regions of Apulia, Calabria and Basilicata would remain firmly under Byzantine control until the 11th century. In ca. 965, a new theme, that of Lucania, was established, and the stratēgos (military governor) of Bari was raised to the title of katepanō of Italy, usually with the rank of patrikios. The title of katepanō meant "the uppermost" in Greek. This elevation was deemed militarily necessary after the final loss of nearby Sicily, a previously Byzantine possession, to the Arabs.

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