Langenberg transmission tower, Radio transmission tower in Langenberg, Germany.

The Langenberg transmission tower is a 301-meter-high steel structure in the Bergisches Land region that houses two separate broadcast facilities for radio and television. The construction distributes signals across a wide area of North Rhine-Westphalia and remains visible from considerable distances.

A 15 kW medium-wave transmitter on the Hordtberg went on air on 15 January 1927, replacing stations in Elberfeld and Dortmund-Dorstfeld. In 1934 a 160-metre wooden tower replaced the two steel masts, but a tornado destroyed it on 10 October 1935; a triangular aerial on three 45-metre wooden towers followed that December. SS-Postschutz troops blew up the entire aerial system on 12 April 1945.

The site's name is tied to the Hordtberg, the hill above Langenberg that was chosen for the transmitter after field-strength measurements. In the early 1930s communist groups tried to tap the studio-to-transmitter line to broadcast propaganda; they failed, but hung a red star on one of the towers, removed the same day. The WDR's central transmitter network control (ZSÜ) at the site steers much of the WDR's broadcasting operations.

The tower is visible from considerable distances and can be easily identified from various points across the region. Clear sightlines from elevated positions make it an effective navigation reference.

The 1935 tornado that destroyed the 160-metre wooden tower was a windhose of force 12; the replacement was a triangular aerial on three 45-metre wooden lattice towers, finished that December. The present 301-metre steel mast dates from 1988–1990, when it replaced a 95-metre mediumwave mast and a 210-metre TV/FM mast.