Dalhem (French pronunciation: [dalɛm]; Walloon: Dålem) is a municipality of Wallonia located in the province of Liège, Belgium.

Together with the Land of Valkenburg [nl] and Rolduc, Dalhem was henceforth referred to in the official documents as the 'Lands of Overmaas'.

Economically, the coal mines around Dalhem were of particular importance to the Dutch, while the place itself provided a good military base against the enemy through its castle.

In 1665, Robert van Ittersum built the town hall in Dalhem, which today still houses a Nassau coat of arms with the lion above the gate.

Warsage was one of the first villages to be captured in the German invasion of Belgium at the start of World War I in August 1914.

According to Nicolas Rémy, in his work Daemonolatreiae libri tres the succubus Abrahel appeared in Dalhem in the year 1581.