The Republic of Venice (Italian: Repubblica di Venezia, Venetian: Repùblica Vèneta or Repùblica de Venesia) was a state originating from the city of Venice in Northeastern Italy. It existed for over a millennium, from the late 7th century until 1797. It was formally known as the Most Serene Republic of Venice (Italian: Serenissima Repubblica di Venezia, Venetian: Serenìsima Repùblica Vèneta or Repùblica de Venesia) and is often referred to as La Serenissima, in reference to its title as one of the "Most Serene Republics". The Republic's modern reputation is widely based on its preference for economic supremacy over military might, despite its long history of war and conquest.

The city of Venice originated as a collection of lagoon communities banded together for mutual defence from the Lombards, Huns and other invading peoples as the power of the Western Roman Empire dwindled in northern Italy. At some point in the first decades of the eighth century, the people of the lagoon elected their first leader Ursus (or Orso Ipato), who was confirmed by Byzantium and given the titles of hypatus and dux. He was the first historical Doge of Venice. Tradition, however, first attested in the early 11th century, states that the Venetians first proclaimed one Anafestus Paulicius duke in 697, though this story dates to no earlier than the chronicle of John the Deacon. Whichever the case, the first doges had their power base in Heraclea.

Venice (Italian: Venezia [veˈnɛttsja] ( listen), Venetian: Venexia [veˈnɛsja]; (Latin: Venetia) is a city in northeast Italy sited on a group of 118 small islands separated by canals and linked by bridges. It is located in the marshy Venetian Lagoon which stretches along the shoreline between the mouths of the Po and the Piave Rivers. Venice is renowned for the beauty of its setting, its architecture and its artworks. The city in its entirety is listed as World Heritage Site, along with its lagoon.

Venice is the capital of the Veneto region. In 2009, there were 270,098 people residing in Venice's comune (the population estimate of 272,000 inhabitants includes the population of the whole Comune of Venezia; around 60,000 in the historic city of Venice (Centro storico); 176,000 in Terraferma (the Mainland), mostly in the large frazioni of Mestre and Marghera; 31,000 live on other islands in the lagoon). Together with Padua and Treviso, the city is included in the Padua-Treviso-Venice Metropolitan Area (PATREVE) (population 1,600,000).