Fernmeldeturm Siegen-Süd, Telecommunications tower in Siegen-Süd, Germany.

The Fernmeldeturm Siegen-Süd is a 134-meter-tall concrete structure with a cylindrical form that stands out clearly in the Siegen-Süd skyline. The facility transmits signals for mobile networks, radio broadcasts, and other communication services across the Siegen-Wittgenstein region.

The Eisernhardt tower entered service in 1976 as a 134-metre reinforced-concrete Typenturm (type FMT 2/73), making it the tallest structure in Siegen's city area. It replaced a smaller transmission tower standing close by, which was shut down and demolished once the new mast was operating. Until the late 2010s the site also kept analogue radio relays for police, fire service, rescue and civil protection as a fallback level for digital radio.

The tower serves as a key landmark visible from many points in the district, its modern concrete form part of the infrastructure that supports daily communication for people across the region.

The tower can be viewed from various points in the surrounding area and is accessible from a distance for photography and observation. Note that the structure itself is not open to the public due to operational and safety requirements.

Until the late 2010s the tower kept analogue radio relays for the police, fire service, rescue service and civil protection, each with its own channel to the control centre. Despite its exposed hilltop position, gaps remained in Freudenberg and the Burbacher Hickengrund; the equipment then served only as a fallback for digital radio.