Troldkirken is a Stone Age long barrow near the village of Sønderholm, Denmark.
It was constructed during the Funnelbeaker culture 5–6.000 years ago and is marked out by 47 megaliths. Placed on the top of the barrow is a polygonal chambered dolmen with a large capstone. The whole monument is some 50 metres long.
The name Troldkirken means both Church of the Troll and Church of Sorcery in Danish. There are several tumuli and dolmens in the area.
The barrow has been a protected site since 1809, and was one of the first prehistoric relics to be protected by law in Denmark. Today The Historical Museum of Northern Jutland in Aalborg attends the barrow.