Dunkel, or Dunkles, is a word used for several types of dark German lager. Dunkel is the German word meaning "dark", and dunkel beers typically range in color from amber to dark reddish brown. They are characterized by their smooth, malty flavor. In informal terms, such as when ordering at a bar, "dunkel" is likely to mean whatever dark beer the bar has on tap, or sells most of; in much of north and western Germany, especially near Düsseldorf, this may be Altbier.

In Bavaria, dunkel, along with helles, is a traditional style brewed in Munich and popular throughout Bavaria. With alcohol concentrations of 4.5% to 6.0% by volume, dunkels are weaker than doppelbocks, another traditional dark Bavarian beer. Dunkels are produced using Munich malts, which give the dunkel its color. Other malts or flavors may also be added.

Many dunkels have a distinctive malty flavor that comes from a special brewing technique called decoction mashing. Most commonly, dunkel beers are dark lagers, but the term is also used to refer to dark wheat beers such as Franziskaner Hefe-Weisse Dunkel. Dunkel weizen is another term used to refer to dark wheat beers, which are fruity and sweet with more dark, roasted malts than their lighter counterpart, the hefeweizen.