Until January 1, 2007 Sundeved (German: Sundewitt) was a municipality in the former South Jutland County on the east coast of the Jutland peninsula in south Denmark. The municipality covered an area of 69 km², and had a total population of 5,298 (2005). Its last mayor was John Solkær Pedersen.
The main town and the site of its municipal council was the town of Sønderborg, in neighboring Sønderborg municipality. Towns in the municipality included Avnbøl, Ballebro, Blans, Stenderup, Ullerup, Vester Sottrup, and Øster Sottrup.
Ferry service connects the former municipality at the town of Ballebro over Als Fjord to the town of Hardeshøj.
The municipality was created in 1970 as the result a kommunalreform ("Municipality Reform") that merged a number of existing parishes:
Sundeved municipality ceased to exist as the result of Kommunalreformen ("The Municipality Reform" of 2007). It was combined with existing Augustenborg, Broager, Gråsten, Nordborg, Sydals, and Sønderborg municipalities to form the new Sønderborg municipality. This created a municipality with an area of 499 km² and a total population of 49,886 (2005). The new municipality belongs to the new Region of Southern Denmark.