Halleberg is a table mountain by lake Vänern in Vänersborg Municipality, Västergötland, Sweden.

Halleberg, part of which protrudes into Lake Vänern is separated in the south by about 500 m (1,600 ft) wide valley from the adjacent Hunneberg (also a table mountain).

The Palaeozoic rocks are deposited directly on the crystalline peneplain bedrock, which in this range consists of göta granite.

The vegetation on the mountain plateau is dominated by spruce and pine, and the expanse of bog, while on scree lower parts are more species.

It is almost completely naturally fortified by the mountain's steep slopes, large stone ramparts being primarily at the Storgårdsklev steps in the southwest.