Ottilienberg, Sandstone hill with pilgrimage church ruins near Eppingen, Baden-Württemberg, Germany

Ottilienberg is a mountain near Eppingen in Baden-Württemberg, Germany, with medieval ruins on its summit. The remains include a former pilgrimage chapel and parts of a military fortification that once stood side by side on the hilltop.

A pilgrimage church was built on the summit in 1473, and a military fortification designed as an artillery emplacement was added in 1697. The site suffered heavy damage in 1945, which led to reconstruction that changed the original forms of the structures.

The chapel's name recalls Saint Odilia, but the sources document no Alsatian patronage; the hill's pull was local. South of the chapel lay a graveyard, and farm buildings stood around it, serving the pilgrims who came up from Eppingen and nearby villages. The church was donated in 1473, and the site kept its religious role even after the 1697 conversion of the summit into an artillery fortress.

The summit is reachable by marked hiking trails from Eppingen, with clear signage along the way. Sturdy footwear is a good idea, as the paths can be uneven or slippery depending on the weather.

The chapel visible today was rebuilt between 1954 and 1955 after a bombing raid in 1945 destroyed the original structure, so its current form is simpler than what stood there before. What looks like an ancient ruin is in part a postwar reconstruction, which gives the site an unusual double identity.