Leuchtturm Gellen, Lighthouse on Insel Hiddensee, Germany.

The Gellen Lighthouse is a structure located at the southern tip of Insel Hiddensee, distinguished by its white tower shaft with red gallery and lantern house. This 12 meter tall construction features metal components typical of Baltic Sea lighthouses.

This lighthouse was built in 1905 by the Berlin-based company Julius Pintsch and began operations in September 1907 after materials were laboriously transported to the island. The extended construction period was necessary due to the remote location.

The tower has appeared on postcards since it was built, and it was printed on a 5-million-mark emergency note issued by the Rügen district on 20 August 1923. On 13 May 1975 the GDR post issued a 10-pfennig stamp showing it, designed by Rostock graphic artist Jochen Bertholdt in a run of 15 million. In 2019 the private service NordBrief used it on a 145-cent stamp.

The tower stands on the Gellen, the southern part of Hiddensee, within the Western Pomerania Lagoon Area National Park; it is not open to climb, so the visit is to the exterior and the surrounding shoreline. The crossing from Stralsund or Rügen is by ferry, and cars stay on the mainland.

At low tide, remnants of an older 14th-century lighthouse structure become visible along the western coast of the Gellen peninsula. These remains show that the site was used as a navigation point as far back as the Middle Ages.