Fort Ebersberg, also known as Fort Rüdlingen, is a Swiss Border Line fortification built between 1938 and 1940 in the Canton of Zurich. Located near Berg am Irchel, it was constructed to defend against potential German invasion during the opening of World War II. As the only such position in the Zurich canton, it formed part of Switzerland's defensive strategy along the Rhine.
The fort carries the military designation A5438 and represents a significant example of Swiss World War II-era military architecture.