Catanzaro (US: , Italian: [katanˈdzaːro] (listen) or [katanˈtsaːro]; Sicilian: Catanzaru [katanˈtsaːɾʊ]; Ancient Greek: Κατανθέρος, romanized: Katanthéros, or Κατασταρίοι Λοκροί, Katastaríoi Lokrói; Medieval Greek: Καταντζάριον, romanized: Katantzàrion; Latin: Catacium), also known as the "City of the two Seas", is an Italian city of 86,183 inhabitants (2020), the capital of the Calabria region and of its province and the second most populated comune of the region, behind Reggio Calabria.

The archbishop's seat was the capital of the province of Calabria Ultra for over 200 years. It houses the University "Magna Græcia", the second-largest university in Calabria.

Catanzaro is an urban centre, with much activity, including some coastal towns, such as Sellia Marina and Soverato, and the municipalities of Silas, with a total of 156,196 inhabitants. Catanzaro is being consolidated to form a greater metropolitan area, by the Region of Calabria, and in connection with the town of Lamezia Terme, comprising 10 municipalities. This will lead to the creation of an integrated area involving over 200,000 inhabitants.

During the summer months, the Ionian coast from Catanzaro to Soverato is an important tourist attraction, especially for the youth, and is in the presence of several important structures located in the coastal districts of the city and the towns of Copanello and Soverato.

Catanzaro is also known as the city of the three V's, referring to the three distinct features of the city, namely Saint Vitalian, the patron saint; velvet, because the city has been an important silk centre since Byzantine times; and wind (vento in Italian), because of the strong breezes from the Ionian Sea and La Sila.

"VVV" was the symbol by which Catanzaro's silk industry was known, identified for both its domestic and foreign markets, and iconic for the finest fabrication of silks, velvets, damasks, and brocades from the city.