Nordborg is a municipality (Danish, kommune) in South Jutland County on the northwest half of the island of Als off the east coast of the Jutland peninsula in south Denmark. The municipality covers an area of 125 km², and has a total population of 13,956 (2005). Its mayor is Jan Prokopek Jensen, a member of the Social Democrats (Socialdemokraterne) political party.
The site of its municipal council is the town of Nordborg.
Neighboring municipalities are Augustenborg to the southeast, and Sundeved and Sønderborg to the south, albeit separated from the island municipality by Als Fjord, the waterway which separates the island of Als from the Jutland mainland. To the north is the Little Belt. Its southwest shores are defined in part by the waters of Steg's Cove (Stegsvig) and Sand Cove (Sandvig).
Ferry service connects the municipality at the town of Hardeshøj with Sundeved municipality at the town of Ballebro.
The municipality was created in 1970 as the result of a kommunalreform ("Municipality Reform") that merged a number of existing parishes:
Egen Parish
Havnbjerg Parish
Nordborg Parish
Oksbøl Parish
Svenstrup Parish
The municipalitiy has been greatly influenced by the presence of Danfoss, a global producer of components for refrigeration and airconditioning, heating and motion control applications, headquartered in the town and founded in 1933.
By January 1, 2007 Nordborg municipality will cease to exist as the result of Kommunalreformen ("The Municipality Reform" of 2007). It will be merged with existing Augustenborg, Broager, Gråsten, Sundeved, Sydals, and Sønderborg municipalities to form the new Sønderborg municipality. This will create a municipality with an area of 499 km² and a total population of 49,886 (2005). The new municipality will belong to the new Region Syddanmark ("South Denmark Region").
Alfred