Wiehenturm, Wooden observation tower in Preußisch Oldendorf, Germany.

The Wiehenturm is a wooden observation tower south of Preußisch Oldendorf in the Wiehengebirge, standing 30.5 m tall including its new roof. A 103-step staircase leads to the platform at about 232 m above sea level, from which the North German Plain is visible.

The tower was built as a tourism facility to give visitors a central vantage point over the Minden-Lübbecke district landscape. Its creation grew from efforts to make the region more interesting for outdoor recreation and walking.

The tower displays local building traditions using wood as a material common to the region, and visitors climb it to experience a wider view of the flat landscape below. The wooden structure connects people to how this area has traditionally looked from elevated vantage points.

The tower stands next to a car park and is easily reached on foot. A staircase of 103 steps leads to the platform. A shelter hut and a barbecue area are beside the tower. The platform rises only slightly above the treetops in summer.

The tower has no mains power; during amateur radio contests a diesel generator ran equipment from a caravan beside it. Contest group DK0LK, club station of DARC local branch N22, operated from the platform for 24 hours on the first weekend of March, May, July and September, reaching Portugal about 2,000 km away.