Sundeved is a peninsula on the east coast of the Jutland peninsula in south Denmark. It lies between Åbenrå Fjord and Als Fjord to the north, Alssund to the east and Flensborg Fjord to the south. The westernmost part of the city of Sønderborg is located on the peninsula. Most of Sønderborg is on the island of Als.
Until January 1, 2007 Sundeved (German: Sundewitt) was also the name of a municipality in the former South Jutland County 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:Nybøl (German: Nübel) Parish
Sottrup (German:Satrup) Parish
Ullerup (German:Ulderup) Parish
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 over 70,000 people (2005). The new municipality belongs to the new Region of Southern Denmark.