Cavarzere (Italian pronunciation: [kaˈvardzere]) is a comune (municipality) in the Metropolitan City of Venice in the Italian region of Veneto, located about 35 kilometres (22 miles) southwest of Venice.

Neighbouring municipalities of Cavarzere are: Adria, Agna, Anguillara Veneta, Chioggia, Cona, Loreo, Pettorazza Grimani, San Martino di Venezze.

Cavarzere is located on a plain crossed by the Adige and numerous canals.

Cavarzere dates from the pre-Roman age as a military outpost of the nearby town of Hatria, the future Adria. The etymology of Cavarzere is from the Latin Caput Aggeris because once was the only village in the area having an embankment system. After the fall of the Western Roman Empire, it became a refuge for people escaping from barbarian invasion.

For this viable location (along the River Adige and not far from the Venetian Lagoon) as the last town before the Papal States, Cavarzere was destroyed by many artificial floods and invasions by the Lombards, the Genoese, the French and also from the Duchy of Ferrara. Cavarzere followed the fate of the Venetian Republic until the latter was annexed by the Austrian Empire with the Treaty of Campo Formio in 1797. After a brief rule of Kingdom of Italy (a protectorate of French Empire), with the Congress of Vienna in 1815 Cavarzere was annexed to the Kingdom of Lombardy-Venetia. Since 1866 it became part of unified Italy.

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