Until 1 January 2007 Sydals (German: Südalsen) was a municipality (Danish, kommune) in South Jutland County on the southern part of the island of Als off the east coast of the Jutland peninsula in south Denmark.
The municipality covered an area of 95 km2, and had a total population of 6,527 (2005).
Other towns and villages in the municipality were Høruphav, Lysabild, Mommark, Skovby, Sønderby and Tandslet.
This created a municipality with an area of 499 km2 and a total population of 49,886 (2005).
The new municipality belongs to Region of Southern Denmark.