Castelnuovo del Garda is an Italian comune (municipality), in the Province of Verona, in Veneto, on a couple of morainic hills a few kilometres south-east of Lake Garda. Verona is about 20 km to the east, Venice is 140 km east and Milan 140 km west.

Castelnuovo del Garda has a short beach on the lake, between the municipalities of Peschiera del Garda and Lazise. The comune borders the municipalities of Bussolengo, Lazise, Peschiera del Garda, Sona, and Valeggio sul Mincio.

Gardaland, the biggest amusement park in Italy, is expanding mainly within the Castelnuovo municipality, close to Lake Garda shores.

From a few archaeological remains found on the top of the main hill (called Monte Alto), probably Castelnuovo del Garda was already inhabited during the prehistoric age.

During the Roman period, it was first known as Beneventum, and was later renamed Quadrivium which literally means 4 roads, or crossroad. Indeed, its location was strategical being at the crossroad between the Via Gallica (which was connecting the modern Torino with the modern Venezia passing by Milan, the actual SS11), and a connection with the Via Claudia Augusta (which was connecting central Italy with Austria passing by the Val d'Adige and the Alps).

In the 12th century, Quadrivium was destroyed by Frederick Barbarossa. Consequently, rebuilt as a fortified town, Quadrivium was renamed Castrum Novum (which means New Castle), and the name has remained unchanged with the Italian version Castelnuovo.

During the centuries, Castelnuovo passed under different political controls, from the Lord of Verona (Signoria degli Scaligeri), the Lord of Milano (Signoria dei Visconti), the Venetian Republic, the Austrian empire (see the next chapter for the "Castelnuovo massacre"), and eventually becoming part of the Regno d'Italia with the third Italian independence war and the consequential Armistice of Cormons, in the 1866.

Only in 1970, Castelnuovo took its actual name, Castelnuovo del Garda, to highlight its location close to the Lake Garda shores.